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In Soviet Russia, they had warehouses full of capacitors...
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Phil Hobbs
May 16, 2013, 9:07:49 PM5/16/13
to
I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
about 6 cents each. Then recently I bought another lifetime's supply,
just in case. ;) http://tinyurl.com/cc7yvo8
Together with one of John's cookie tins or one of my collection of 70 mm
film cans, feedthrough caps make it a lot easier to do good measurements
on high frequency stuff.
I got a bunch of old school NPO trim caps as well--great for making wide
frequency range voltage dividers and so on.
http://tinyurl.com/csh6hd2
Any other good post-Soviet (or other) component sources we should all
know about?
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510 USA
+1 845 480 2058
hobbs at electrooptical dot net
http://electrooptical.net
about 6 cents each. Then recently I bought another lifetime's supply,
just in case. ;) http://tinyurl.com/cc7yvo8
Together with one of John's cookie tins or one of my collection of 70 mm
film cans, feedthrough caps make it a lot easier to do good measurements
on high frequency stuff.
I got a bunch of old school NPO trim caps as well--great for making wide
frequency range voltage dividers and so on.
http://tinyurl.com/csh6hd2
Any other good post-Soviet (or other) component sources we should all
know about?
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510 USA
+1 845 480 2058
hobbs at electrooptical dot net
http://electrooptical.net
John Larkin
May 16, 2013, 9:22:06 PM5/16/13
to
On Thu, 16 May 2013 21:07:49 -0400, Phil Hobbs
<pcdhSpamM...@electrooptical.net> wrote:
>I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>about 6 cents each. Then recently I bought another lifetime's supply,
>just in case. ;) http://tinyurl.com/cc7yvo8
>
>Together with one of John's cookie tins or one of my collection of 70 mm
>film cans, feedthrough caps make it a lot easier to do good measurements
>on high frequency stuff.
>
>I got a bunch of old school NPO trim caps as well--great for making wide
>frequency range voltage dividers and so on.
>http://tinyurl.com/csh6hd2
>
>Any other good post-Soviet (or other) component sources we should all
>know about?
>
Night vision gear! Hydrogen thyratrons!
<pcdhSpamM...@electrooptical.net> wrote:
>I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>about 6 cents each. Then recently I bought another lifetime's supply,
>just in case. ;) http://tinyurl.com/cc7yvo8
>
>Together with one of John's cookie tins or one of my collection of 70 mm
>film cans, feedthrough caps make it a lot easier to do good measurements
>on high frequency stuff.
>
>I got a bunch of old school NPO trim caps as well--great for making wide
>frequency range voltage dividers and so on.
>http://tinyurl.com/csh6hd2
>
>Any other good post-Soviet (or other) component sources we should all
>know about?
>
--
John Larkin Highland Technology, Inc
jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser drivers and controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro acquisition and simulation
George Herold
May 17, 2013, 9:54:18 AM5/17/13
to
On May 16, 9:07 pm, Phil Hobbs
the later would make good power supply feed throughs for an RF
circuit. I think we pay a few buck each for those from Newark.
>
> Together with one of John's cookie tins or one of my collection of 70 mm
> film cans, feedthrough caps make it a lot easier to do good measurements
> on high frequency stuff.
>
> I got a bunch of old school NPO trim caps as well--great for making wide
> frequency range voltage dividers and so on.http://tinyurl.com/csh6hd2
that.
And also some old RF power transistors.
George H.
<pcdhSpamMeSensel...@electrooptical.net> wrote:
> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
> about 6 cents each. Then recently I bought another lifetime's supply,
> just in case. ;) http://tinyurl.com/cc7yvo8
Sorry stupid question; Is the 15nF in series or is it to ground? So
> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
> about 6 cents each. Then recently I bought another lifetime's supply,
> just in case. ;) http://tinyurl.com/cc7yvo8
the later would make good power supply feed throughs for an RF
circuit. I think we pay a few buck each for those from Newark.
>
> Together with one of John's cookie tins or one of my collection of 70 mm
> film cans, feedthrough caps make it a lot easier to do good measurements
> on high frequency stuff.
>
> I got a bunch of old school NPO trim caps as well--great for making wide
>
> Any other good post-Soviet (or other) component sources we should all
> know about?
We get glass work filled with Rb from Russia... but not much call for
> Any other good post-Soviet (or other) component sources we should all
> know about?
that.
And also some old RF power transistors.
George H.
tm
May 17, 2013, 10:29:44 AM5/17/13
to
"George Herold" <ghe...@teachspin.com> wrote in message
news:e8808a0e-15a9-4f73...@s18g2000yqg.googlegroups.com...
On May 16, 9:07 pm, Phil Hobbs
<pcdhSpamMeSensel...@electrooptical.net> wrote:
> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
> about 6 cents each. Then recently I bought another lifetime's supply,
> just in case. ;) http://tinyurl.com/cc7yvo8
Sorry stupid question; Is the 15nF in series or is it to ground? So
the later would make good power supply feed throughs for an RF
circuit. I think we pay a few buck each for those from Newark.
>
> Together with one of John's cookie tins or one of my collection of 70 mm
> film cans, feedthrough caps make it a lot easier to do good measurements
> on high frequency stuff.
>
> I got a bunch of old school NPO trim caps as well--great for making wide
> frequency range voltage dividers and so on.http://tinyurl.com/csh6hd2
>
> Any other good post-Soviet (or other) component sources we should all
> know about?
We get glass work filled with Rb from Russia... but not much call for
that.
And also some old RF power transistors.
George H.
+++++++++++++++++++++++++++=
<pcdhSpamMeSensel...@electrooptical.net> wrote:
> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
> about 6 cents each. Then recently I bought another lifetime's supply,
> just in case. ;) http://tinyurl.com/cc7yvo8
Sorry stupid question; Is the 15nF in series or is it to ground? So
the later would make good power supply feed throughs for an RF
circuit. I think we pay a few buck each for those from Newark.
>
> Together with one of John's cookie tins or one of my collection of 70 mm
> film cans, feedthrough caps make it a lot easier to do good measurements
> on high frequency stuff.
>
> I got a bunch of old school NPO trim caps as well--great for making wide
> frequency range voltage dividers and so on.http://tinyurl.com/csh6hd2
>
> Any other good post-Soviet (or other) component sources we should all
> know about?
We get glass work filled with Rb from Russia... but not much call for
that.
And also some old RF power transistors.
George H.
Tunnel diodes, both Ge and GaAs types.
About half of them work.
PMTs.
Moran double oven OCXOs that seem very good except QA is somewhat poor.
Phil Hobbs
May 17, 2013, 10:38:53 AM5/17/13
to
On 05/17/2013 09:54 AM, George Herold wrote:
> On May 16, 9:07 pm, Phil Hobbs
> <pcdhSpamMeSensel...@electrooptical.net> wrote:
>> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>> about 6 cents each. Then recently I bought another lifetime's supply,
>> just in case. ;) http://tinyurl.com/cc7yvo8
>
> Sorry stupid question; Is the 15nF in series or is it to ground? So
> the later would make good power supply feed throughs for an RF
> circuit. I think we pay a few buck each for those from Newark.
They're feedthroughs, i.e. the capacitance is to ground and is fully
> On May 16, 9:07 pm, Phil Hobbs
> <pcdhSpamMeSensel...@electrooptical.net> wrote:
>> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>> about 6 cents each. Then recently I bought another lifetime's supply,
>> just in case. ;) http://tinyurl.com/cc7yvo8
>
> Sorry stupid question; Is the 15nF in series or is it to ground? So
> the later would make good power supply feed throughs for an RF
> circuit. I think we pay a few buck each for those from Newark.
coaxial. They work _great_. The guy is asking $45 plus shipping for
350 of them at the moment. He mistakenly sent me two boxes, so rather
than send the second one back to Lithuania, I just sent him another $40.
The other nice thing is that the ferrules are tin-plated brass, so they
solder really well. I put them in slightly counterbored holes in
die-cast aluminum boxes, with the board mounted inside the lid, so I can
solder the feedthrough to the ground plane, like this:
https://dl.dropboxusercontent.com/u/105025837/Link%20to%20TempControllerAssembled.png
. The feedthroughs are the grey things at the edges of the middle of
the board. The one on the right edge is easiest to see.
>
>>
>> Together with one of John's cookie tins or one of my collection of 70 mm
>> film cans, feedthrough caps make it a lot easier to do good measurements
>> on high frequency stuff.
>>
>> I got a bunch of old school NPO trim caps as well--great for making wide
>> frequency range voltage dividers and so on.http://tinyurl.com/csh6hd2
>>
>> Any other good post-Soviet (or other) component sources we should all
>> know about?
>
> We get glass work filled with Rb from Russia... but not much call for
> that.
>
> And also some old RF power transistors.
my inner Oz.
Cheers
Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
Joerg
May 17, 2013, 10:45:13 AM5/17/13
to
Phil Hobbs wrote:
> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
> about 6 cents each. Then recently I bought another lifetime's supply,
> just in case. ;) http://tinyurl.com/cc7yvo8
>
> Together with one of John's cookie tins or one of my collection of 70 mm
> film cans, feedthrough caps make it a lot easier to do good measurements
> on high frequency stuff.
>
> I got a bunch of old school NPO trim caps as well--great for making wide
> frequency range voltage dividers and so on.
> http://tinyurl.com/csh6hd2
>
> Any other good post-Soviet (or other) component sources we should all
> know about?
>
Yes, nuvistors. They must have hoarded those because for years they have
> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
> about 6 cents each. Then recently I bought another lifetime's supply,
> just in case. ;) http://tinyurl.com/cc7yvo8
>
> Together with one of John's cookie tins or one of my collection of 70 mm
> film cans, feedthrough caps make it a lot easier to do good measurements
> on high frequency stuff.
>
> I got a bunch of old school NPO trim caps as well--great for making wide
> frequency range voltage dividers and so on.
> http://tinyurl.com/csh6hd2
>
> Any other good post-Soviet (or other) component sources we should all
> know about?
>
been showing up by the egg carton:
http://www.ebay.com/itm/2x-6E12N-V-6E12N-Nuvistor-type-Metal-ceramic-HF-POWER-AMPLIFICATION-SOVIET-TUBE-/310395062476?pt=Vintage_Electronics_R2&hash=item4844fcc8cc
Then you'd be prepared for situations where you need a really hi-Z input
and protection diodes aren't an option for some reason. If you are
really lucky you might get a complete carton with CCCP on there :-)
I only know the American nuvistors from personal experience. Here is a
typical datasheet, and Soviet ones were AFAIR mostly copies of the
American products, like usual:
http://www.ko4bb.com/Manuals/RCA/RCA_2CW4_6CW4_13CW4_Nuvistor.pdf
Amazing, even back in 1962 they had the occasional text blurb such as
the trademark hint in English and Spanish. I remember nuvistors that
would work quite well with less than 50V plate voltage. Some are even
happy with 20V. But of course they do require the filament to glow, so
no Energy Star rating there. Their noise performance at RF (in my case
all >100MHz) is stunning, considering their vintage.
--
Regards, Joerg
http://www.analogconsultants.com/
Michael A. Terrell
May 17, 2013, 10:46:26 AM5/17/13
to
Phil Hobbs wrote:
>
> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
> about 6 cents each. Then recently I bought another lifetime's supply,
> just in case. ;) http://tinyurl.com/cc7yvo8
Joerg
May 17, 2013, 10:53:45 AM5/17/13
to
Phil Hobbs wrote:
> On 05/17/2013 09:54 AM, George Herold wrote:
>> On May 16, 9:07 pm, Phil Hobbs
>> <pcdhSpamMeSensel...@electrooptical.net> wrote:
>>> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>>> about 6 cents each. Then recently I bought another lifetime's supply,
>>> just in case. ;) http://tinyurl.com/cc7yvo8
>>
>> Sorry stupid question; Is the 15nF in series or is it to ground? So
>> the later would make good power supply feed throughs for an RF
>> circuit. I think we pay a few buck each for those from Newark.
>
> They're feedthroughs, i.e. the capacitance is to ground and is fully
> coaxial. They work _great_. The guy is asking $45 plus shipping for
> 350 of them at the moment. He mistakenly sent me two boxes, so rather
> than send the second one back to Lithuania, I just sent him another $40.
>
> The other nice thing is that the ferrules are tin-plated brass, so they
> solder really well. I put them in slightly counterbored holes in
> die-cast aluminum boxes, with the board mounted inside the lid, so I can
> solder the feedthrough to the ground plane, like this:
> https://dl.dropboxusercontent.com/u/105025837/Link%20to%20TempControllerAssembled.png
> . The feedthroughs are the grey things at the edges of the middle of
> the board. The one on the right edge is easiest to see.
>
Ooooh, Soviet feed-thru caps installed in apparatsky Amerikansky. Lenin
> On 05/17/2013 09:54 AM, George Herold wrote:
>> On May 16, 9:07 pm, Phil Hobbs
>> <pcdhSpamMeSensel...@electrooptical.net> wrote:
>>> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>>> about 6 cents each. Then recently I bought another lifetime's supply,
>>> just in case. ;) http://tinyurl.com/cc7yvo8
>>
>> Sorry stupid question; Is the 15nF in series or is it to ground? So
>> the later would make good power supply feed throughs for an RF
>> circuit. I think we pay a few buck each for those from Newark.
>
> They're feedthroughs, i.e. the capacitance is to ground and is fully
> coaxial. They work _great_. The guy is asking $45 plus shipping for
> 350 of them at the moment. He mistakenly sent me two boxes, so rather
> than send the second one back to Lithuania, I just sent him another $40.
>
> The other nice thing is that the ferrules are tin-plated brass, so they
> solder really well. I put them in slightly counterbored holes in
> die-cast aluminum boxes, with the board mounted inside the lid, so I can
> solder the feedthrough to the ground plane, like this:
> https://dl.dropboxusercontent.com/u/105025837/Link%20to%20TempControllerAssembled.png
> . The feedthroughs are the grey things at the edges of the middle of
> the board. The one on the right edge is easiest to see.
>
would have a hissy fit.
Which material are those gray strain relief splotches at the bottom?
Joerg
May 17, 2013, 10:54:00 AM5/17/13
to
Phil Hobbs wrote:
> On 05/17/2013 09:54 AM, George Herold wrote:
>> On May 16, 9:07 pm, Phil Hobbs
>> <pcdhSpamMeSensel...@electrooptical.net> wrote:
>>> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>>> about 6 cents each. Then recently I bought another lifetime's supply,
>>> just in case. ;) http://tinyurl.com/cc7yvo8
>>
>> Sorry stupid question; Is the 15nF in series or is it to ground? So
>> the later would make good power supply feed throughs for an RF
>> circuit. I think we pay a few buck each for those from Newark.
>
> They're feedthroughs, i.e. the capacitance is to ground and is fully
> coaxial. They work _great_. The guy is asking $45 plus shipping for
> 350 of them at the moment. He mistakenly sent me two boxes, so rather
> than send the second one back to Lithuania, I just sent him another $40.
>
> The other nice thing is that the ferrules are tin-plated brass, so they
> solder really well. I put them in slightly counterbored holes in
> die-cast aluminum boxes, with the board mounted inside the lid, so I can
> solder the feedthrough to the ground plane, like this:
> https://dl.dropboxusercontent.com/u/105025837/Link%20to%20TempControllerAssembled.png
> . The feedthroughs are the grey things at the edges of the middle of
> the board. The one on the right edge is easiest to see.
>
> On 05/17/2013 09:54 AM, George Herold wrote:
>> On May 16, 9:07 pm, Phil Hobbs
>> <pcdhSpamMeSensel...@electrooptical.net> wrote:
>>> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>>> about 6 cents each. Then recently I bought another lifetime's supply,
>>> just in case. ;) http://tinyurl.com/cc7yvo8
>>
>> Sorry stupid question; Is the 15nF in series or is it to ground? So
>> the later would make good power supply feed throughs for an RF
>> circuit. I think we pay a few buck each for those from Newark.
>
> They're feedthroughs, i.e. the capacitance is to ground and is fully
> coaxial. They work _great_. The guy is asking $45 plus shipping for
> 350 of them at the moment. He mistakenly sent me two boxes, so rather
> than send the second one back to Lithuania, I just sent him another $40.
>
> The other nice thing is that the ferrules are tin-plated brass, so they
> solder really well. I put them in slightly counterbored holes in
> die-cast aluminum boxes, with the board mounted inside the lid, so I can
> solder the feedthrough to the ground plane, like this:
> https://dl.dropboxusercontent.com/u/105025837/Link%20to%20TempControllerAssembled.png
> . The feedthroughs are the grey things at the edges of the middle of
> the board. The one on the right edge is easiest to see.
>
Phil Hobbs
May 17, 2013, 11:11:23 AM5/17/13
to
Peltiers are silver-epoxied down, so epoxying the leads isn't much more
daring.)
John Larkin
May 17, 2013, 11:41:34 AM5/17/13
to
>I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>about 6 cents each. Then recently I bought another lifetime's supply,
>just in case. ;) http://tinyurl.com/cc7yvo8
>
>Together with one of John's cookie tins or one of my collection of 70 mm
>film cans, feedthrough caps make it a lot easier to do good measurements
>on high frequency stuff.
>
>I got a bunch of old school NPO trim caps as well--great for making wide
>frequency range voltage dividers and so on.
>http://tinyurl.com/csh6hd2
We use these, very nice, small, cheap:
>about 6 cents each. Then recently I bought another lifetime's supply,
>just in case. ;) http://tinyurl.com/cc7yvo8
>
>Together with one of John's cookie tins or one of my collection of 70 mm
>film cans, feedthrough caps make it a lot easier to do good measurements
>on high frequency stuff.
>
>I got a bunch of old school NPO trim caps as well--great for making wide
>frequency range voltage dividers and so on.
>http://tinyurl.com/csh6hd2
http://www.digikey.com/product-detail/en/TZY2Z2R5A001R00/490-2008-2-ND/588029
--
John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Photonics and fiberoptic TTL data links
VME analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators
Phil Hobbs
May 17, 2013, 11:53:20 AM5/17/13
to
On 05/17/2013 11:41 AM, John Larkin wrote:
> On Thu, 16 May 2013 21:07:49 -0400, Phil Hobbs
> <pcdhSpamM...@electrooptical.net> wrote:
>
>> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>> about 6 cents each. Then recently I bought another lifetime's supply,
>> just in case. ;) http://tinyurl.com/cc7yvo8
>>
>> Together with one of John's cookie tins or one of my collection of 70 mm
>> film cans, feedthrough caps make it a lot easier to do good measurements
>> on high frequency stuff.
>>
>> I got a bunch of old school NPO trim caps as well--great for making wide
>> frequency range voltage dividers and so on.
>> http://tinyurl.com/csh6hd2
>
> We use these, very nice, small, cheap:
>
> http://www.digikey.com/product-detail/en/TZY2Z2R5A001R00/490-2008-2-ND/588029
>
>
Those do look nice. NPO, I assume?
> On Thu, 16 May 2013 21:07:49 -0400, Phil Hobbs
> <pcdhSpamM...@electrooptical.net> wrote:
>
>> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>> about 6 cents each. Then recently I bought another lifetime's supply,
>> just in case. ;) http://tinyurl.com/cc7yvo8
>>
>> Together with one of John's cookie tins or one of my collection of 70 mm
>> film cans, feedthrough caps make it a lot easier to do good measurements
>> on high frequency stuff.
>>
>> I got a bunch of old school NPO trim caps as well--great for making wide
>> frequency range voltage dividers and so on.
>> http://tinyurl.com/csh6hd2
>
> We use these, very nice, small, cheap:
>
> http://www.digikey.com/product-detail/en/TZY2Z2R5A001R00/490-2008-2-ND/588029
>
>
Cheers
Phil
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics
160 North State Road #203
Briarcliff Manor NY 10510
Jim Thompson
May 17, 2013, 11:57:22 AM5/17/13
to
On Fri, 17 May 2013 07:45:13 -0700, Joerg <inv...@invalid.invalid>
wrote:
I have an RCA 6DS4 Nuvistor right here in my desk drawer.
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
wrote:
...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
George Herold
May 17, 2013, 12:39:13 PM5/17/13
to
On May 17, 11:41 am, John Larkin
>
Hmm not much of a data sheet. How do they work? Are they the
squezzed mica sheet type thing? Or is it something else. We use
these nice tubular tuning caps, but spendy.
George H.
> --
>
> John Larkin Highland Technology Incwww.highlandtechnology.com jlarkin at highlandtechnology dot com
<jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
> On Thu, 16 May 2013 21:07:49 -0400, Phil Hobbs
>
> On Thu, 16 May 2013 21:07:49 -0400, Phil Hobbs
>
> <pcdhSpamMeSensel...@electrooptical.net> wrote:
> >I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
> >about 6 cents each. Then recently I bought another lifetime's supply,
> >just in case. ;) http://tinyurl.com/cc7yvo8
>
> >Together with one of John's cookie tins or one of my collection of 70 mm
> >film cans, feedthrough caps make it a lot easier to do good measurements
> >on high frequency stuff.
>
> >I got a bunch of old school NPO trim caps as well--great for making wide
> >frequency range voltage dividers and so on.
> >http://tinyurl.com/csh6hd2
>
> We use these, very nice, small, cheap:
>
> http://www.digikey.com/product-detail/en/TZY2Z2R5A001R00/490-2008-2-N...
> >I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
> >about 6 cents each. Then recently I bought another lifetime's supply,
> >just in case. ;) http://tinyurl.com/cc7yvo8
>
> >Together with one of John's cookie tins or one of my collection of 70 mm
> >film cans, feedthrough caps make it a lot easier to do good measurements
> >on high frequency stuff.
>
> >I got a bunch of old school NPO trim caps as well--great for making wide
> >frequency range voltage dividers and so on.
> >http://tinyurl.com/csh6hd2
>
> We use these, very nice, small, cheap:
>
>
Hmm not much of a data sheet. How do they work? Are they the
squezzed mica sheet type thing? Or is it something else. We use
these nice tubular tuning caps, but spendy.
George H.
> --
>
> John Larkin Highland Technology Incwww.highlandtechnology.com jlarkin at highlandtechnology dot com
Ecnerwal
May 17, 2013, 12:50:28 PM5/17/13
to
In article <lMadnWdsY_xj3QvM...@supernews.com>,
3 years or so helping to herd freshman engineering students through
building one of those in half a semester. Then I had to tear them all
down so the next batch could build them again (the joys of supporting
hands on lab work...)
--
Cats, coffee, chocolate...vices to live by
Please don't feed the trolls. Killfile and ignore them so they will go away.
Phil Hobbs <pcdhSpamM...@electrooptical.net> wrote:
> I've never actually seen a hydrogen thyratron--gotta get in touch with
> my inner Oz.
They make a nice switch in a nitrogen laser, among other things. I spent
> I've never actually seen a hydrogen thyratron--gotta get in touch with
> my inner Oz.
3 years or so helping to herd freshman engineering students through
building one of those in half a semester. Then I had to tear them all
down so the next batch could build them again (the joys of supporting
hands on lab work...)
--
Cats, coffee, chocolate...vices to live by
Please don't feed the trolls. Killfile and ignore them so they will go away.
John Larkin
May 17, 2013, 1:19:52 PM5/17/13
to
On Fri, 17 May 2013 11:53:20 -0400, Phil Hobbs
variable caps certainly aren't.
We use the Maxim (!!!) Flecap too. It's a programmable silicon
capacitor.
--
John Larkin Highland Technology, Inc
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser drivers and controllers
<pcdhSpamM...@electrooptical.net> wrote:
>On 05/17/2013 11:41 AM, John Larkin wrote:
>> On Thu, 16 May 2013 21:07:49 -0400, Phil Hobbs
>> <pcdhSpamM...@electrooptical.net> wrote:
>>
>>> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>>> about 6 cents each. Then recently I bought another lifetime's supply,
>>> just in case. ;) http://tinyurl.com/cc7yvo8
>>>
>>> Together with one of John's cookie tins or one of my collection of 70 mm
>>> film cans, feedthrough caps make it a lot easier to do good measurements
>>> on high frequency stuff.
>>>
>>> I got a bunch of old school NPO trim caps as well--great for making wide
>>> frequency range voltage dividers and so on.
>>> http://tinyurl.com/csh6hd2
>>
>> We use these, very nice, small, cheap:
>>
>> http://www.digikey.com/product-detail/en/TZY2Z2R5A001R00/490-2008-2-ND/588029
>>
>>
>Those do look nice. NPO, I assume?
>
Can't recall. The low values probably are. Higher value ceramic
>On 05/17/2013 11:41 AM, John Larkin wrote:
>> On Thu, 16 May 2013 21:07:49 -0400, Phil Hobbs
>> <pcdhSpamM...@electrooptical.net> wrote:
>>
>>> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>>> about 6 cents each. Then recently I bought another lifetime's supply,
>>> just in case. ;) http://tinyurl.com/cc7yvo8
>>>
>>> Together with one of John's cookie tins or one of my collection of 70 mm
>>> film cans, feedthrough caps make it a lot easier to do good measurements
>>> on high frequency stuff.
>>>
>>> I got a bunch of old school NPO trim caps as well--great for making wide
>>> frequency range voltage dividers and so on.
>>> http://tinyurl.com/csh6hd2
>>
>> We use these, very nice, small, cheap:
>>
>> http://www.digikey.com/product-detail/en/TZY2Z2R5A001R00/490-2008-2-ND/588029
>>
>>
>Those do look nice. NPO, I assume?
>
variable caps certainly aren't.
We use the Maxim (!!!) Flecap too. It's a programmable silicon
capacitor.
--
John Larkin Highland Technology, Inc
jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Photonics and fiberoptic TTL data links
John Larkin
May 17, 2013, 1:22:44 PM5/17/13
to
On Fri, 17 May 2013 09:39:13 -0700 (PDT), George Herold
<ghe...@teachspin.com> wrote:
>On May 17, 11:41 am, John Larkin
><jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
>> On Thu, 16 May 2013 21:07:49 -0400, Phil Hobbs
>>
>> <pcdhSpamMeSensel...@electrooptical.net> wrote:
>> >I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>> >about 6 cents each. Then recently I bought another lifetime's supply,
>> >just in case. ;) http://tinyurl.com/cc7yvo8
>>
>> >Together with one of John's cookie tins or one of my collection of 70 mm
>> >film cans, feedthrough caps make it a lot easier to do good measurements
>> >on high frequency stuff.
>>
>> >I got a bunch of old school NPO trim caps as well--great for making wide
>> >frequency range voltage dividers and so on.
>> >http://tinyurl.com/csh6hd2
>>
>> We use these, very nice, small, cheap:
>>
>> http://www.digikey.com/product-detail/en/TZY2Z2R5A001R00/490-2008-2-N...
>>
>
>Hmm not much of a data sheet. How do they work? Are they the
>squezzed mica sheet type thing? Or is it something else. We use
>these nice tubular tuning caps, but spendy.
>
They are ceramic, half-circles sliding past one another or something.
<ghe...@teachspin.com> wrote:
>On May 17, 11:41 am, John Larkin
><jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
>> On Thu, 16 May 2013 21:07:49 -0400, Phil Hobbs
>>
>> <pcdhSpamMeSensel...@electrooptical.net> wrote:
>> >I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>> >about 6 cents each. Then recently I bought another lifetime's supply,
>> >just in case. ;) http://tinyurl.com/cc7yvo8
>>
>> >Together with one of John's cookie tins or one of my collection of 70 mm
>> >film cans, feedthrough caps make it a lot easier to do good measurements
>> >on high frequency stuff.
>>
>> >I got a bunch of old school NPO trim caps as well--great for making wide
>> >frequency range voltage dividers and so on.
>> >http://tinyurl.com/csh6hd2
>>
>> We use these, very nice, small, cheap:
>>
>> http://www.digikey.com/product-detail/en/TZY2Z2R5A001R00/490-2008-2-N...
>>
>
>Hmm not much of a data sheet. How do they work? Are they the
>squezzed mica sheet type thing? Or is it something else. We use
>these nice tubular tuning caps, but spendy.
>
I should take one apart some day.
Sapphire piston caps are great, except for the spendy bit. They come
nonmagnetic (seriously! nonmagnetic) for NMR use.
--
John Larkin Highland Technology, Inc
jlarkin at highlandtechnology dot com
http://www.highlandtechnology.com
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Photonics and fiberoptic TTL data links
Michael A. Terrell
May 17, 2013, 2:39:40 PM5/17/13
to
Jim Thompson wrote:
>
> I have an RCA 6DS4 Nuvistor right here in my desk drawer.
lang...@fonz.dk
May 17, 2013, 5:07:16 PM5/17/13
to
On May 17, 7:22 pm, John Larkin <jlar...@highlandtechnology.com>
wrote:
stepper motor to control it
a bit similar to this: http://www.sm0vpo.com/use/tuning_caps2.htm
> Sapphire piston caps are great, except for the spendy bit. They come
> nonmagnetic (seriously! nonmagnetic) for NMR use.
>
yep, very expensive and quite fragile
-Lasse
wrote:
> On Fri, 17 May 2013 09:39:13 -0700 (PDT), George Herold
>
>
>
>
>
>
>
>
>
> <gher...@teachspin.com> wrote:
> >On May 17, 11:41 am, John Larkin
> ><jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
> >> On Thu, 16 May 2013 21:07:49 -0400, Phil Hobbs
>
> >> <pcdhSpamMeSensel...@electrooptical.net> wrote:
> >> >I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
> >> >about 6 cents each. Then recently I bought another lifetime's supply,
> >> >just in case. ;) http://tinyurl.com/cc7yvo8
>
> >> >Together with one of John's cookie tins or one of my collection of 70 mm
> >> >film cans, feedthrough caps make it a lot easier to do good measurements
> >> >on high frequency stuff.
>
> >> >I got a bunch of old school NPO trim caps as well--great for making wide
> >> >frequency range voltage dividers and so on.
> >> >http://tinyurl.com/csh6hd2
>
> >> We use these, very nice, small, cheap:
>
> >>http://www.digikey.com/product-detail/en/TZY2Z2R5A001R00/490-2008-2-N...
>
> >Hmm not much of a data sheet. How do they work? Are they the
> >squezzed mica sheet type thing? Or is it something else. We use
> >these nice tubular tuning caps, but spendy.
>
> They are ceramic, half-circles sliding past one another or something.
> I should take one apart some day.
>
We make our own from some expensive high Er pcb material and use a
>
>
>
>
>
>
>
>
>
> <gher...@teachspin.com> wrote:
> >On May 17, 11:41 am, John Larkin
> ><jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
> >> On Thu, 16 May 2013 21:07:49 -0400, Phil Hobbs
>
> >> <pcdhSpamMeSensel...@electrooptical.net> wrote:
> >> >I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
> >> >about 6 cents each. Then recently I bought another lifetime's supply,
> >> >just in case. ;) http://tinyurl.com/cc7yvo8
>
> >> >Together with one of John's cookie tins or one of my collection of 70 mm
> >> >film cans, feedthrough caps make it a lot easier to do good measurements
> >> >on high frequency stuff.
>
> >> >I got a bunch of old school NPO trim caps as well--great for making wide
> >> >frequency range voltage dividers and so on.
> >> >http://tinyurl.com/csh6hd2
>
> >> We use these, very nice, small, cheap:
>
> >>http://www.digikey.com/product-detail/en/TZY2Z2R5A001R00/490-2008-2-N...
>
> >Hmm not much of a data sheet. How do they work? Are they the
> >squezzed mica sheet type thing? Or is it something else. We use
> >these nice tubular tuning caps, but spendy.
>
> They are ceramic, half-circles sliding past one another or something.
> I should take one apart some day.
>
stepper motor to control it
a bit similar to this: http://www.sm0vpo.com/use/tuning_caps2.htm
> Sapphire piston caps are great, except for the spendy bit. They come
> nonmagnetic (seriously! nonmagnetic) for NMR use.
>
-Lasse
John Larkin
May 17, 2013, 5:33:44 PM5/17/13
to
GR used to make an oscillator that used a combination variable
capacitor and variable inductor all in one chunk. Forget what they
called it.
Joerg
May 17, 2013, 6:21:26 PM5/17/13
to
George Herold wrote:
> On May 17, 11:41 am, John Larkin
> <jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
>> On Thu, 16 May 2013 21:07:49 -0400, Phil Hobbs
>>
>> <pcdhSpamMeSensel...@electrooptical.net> wrote:
>>> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>>> about 6 cents each. Then recently I bought another lifetime's supply,
>>> just in case. ;) http://tinyurl.com/cc7yvo8
>>> Together with one of John's cookie tins or one of my collection of 70 mm
>>> film cans, feedthrough caps make it a lot easier to do good measurements
>>> on high frequency stuff.
>>> I got a bunch of old school NPO trim caps as well--great for making wide
>>> frequency range voltage dividers and so on.
>>> http://tinyurl.com/csh6hd2
>> We use these, very nice, small, cheap:
>>
>> http://www.digikey.com/product-detail/en/TZY2Z2R5A001R00/490-2008-2-N...
>>
>
> Hmm not much of a data sheet. How do they work? Are they the
> squezzed mica sheet type thing? Or is it something else. We use
> these nice tubular tuning caps, but spendy.
>
I always liked the Muntz edition: Twirled enamel wires. Twirl some more
> On May 17, 11:41 am, John Larkin
> <jjlar...@highNOTlandTHIStechnologyPART.com> wrote:
>> On Thu, 16 May 2013 21:07:49 -0400, Phil Hobbs
>>
>> <pcdhSpamMeSensel...@electrooptical.net> wrote:
>>> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>>> about 6 cents each. Then recently I bought another lifetime's supply,
>>> just in case. ;) http://tinyurl.com/cc7yvo8
>>> Together with one of John's cookie tins or one of my collection of 70 mm
>>> film cans, feedthrough caps make it a lot easier to do good measurements
>>> on high frequency stuff.
>>> I got a bunch of old school NPO trim caps as well--great for making wide
>>> frequency range voltage dividers and so on.
>>> http://tinyurl.com/csh6hd2
>> We use these, very nice, small, cheap:
>>
>> http://www.digikey.com/product-detail/en/TZY2Z2R5A001R00/490-2008-2-N...
>>
>
> Hmm not much of a data sheet. How do they work? Are they the
> squezzed mica sheet type thing? Or is it something else. We use
> these nice tubular tuning caps, but spendy.
>
-> more pF. Untwirl -> less pF. You got about a dozen shots at it, then
... ping ... it broke off.
Phil Hobbs
May 17, 2013, 6:39:00 PM5/17/13
to
15 nF ones are enough to nuke anything above about 1 MHz.
John Larkin
May 17, 2013, 7:07:22 PM5/17/13
to
On Fri, 17 May 2013 18:39:00 -0400, Phil Hobbs
<pcdhSpamM...@electrooptical.net> wrote:
>On 5/17/2013 10:46 AM, Michael A. Terrell wrote:
>>
>> Phil Hobbs wrote:
>>>
>>> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>>> about 6 cents each. Then recently I bought another lifetime's supply,
>>> just in case. ;) http://tinyurl.com/cc7yvo8
>>
>>
>>
>> <http://www.ebay.com/itm/Ceramic-feedthrough-capacitors-330-pF-Set-of-150-New-/350716024069>
>>
>
>Nice. 330 pF is a bit on the small side for a feedthrough, though--my
>15 nF ones are enough to nuke anything above about 1 MHz.
>
>Cheers
>
>Phil Hobbs
I just got 100 ea of 3300pF, $13, also from Lithuania.
<pcdhSpamM...@electrooptical.net> wrote:
>On 5/17/2013 10:46 AM, Michael A. Terrell wrote:
>>
>> Phil Hobbs wrote:
>>>
>>> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
>>> about 6 cents each. Then recently I bought another lifetime's supply,
>>> just in case. ;) http://tinyurl.com/cc7yvo8
>>
>>
>>
>> <http://www.ebay.com/itm/Ceramic-feedthrough-capacitors-330-pF-Set-of-150-New-/350716024069>
>>
>
>Nice. 330 pF is a bit on the small side for a feedthrough, though--my
>15 nF ones are enough to nuke anything above about 1 MHz.
>
>Cheers
>
>Phil Hobbs
ebay is great.
Michael A. Terrell
May 18, 2013, 1:53:09 AM5/18/13
to
Phil Hobbs wrote:
>
> On 5/17/2013 10:46 AM, Michael A. Terrell wrote:
> >
> > Phil Hobbs wrote:
> >>
> >> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
> >> about 6 cents each. Then recently I bought another lifetime's supply,
> >> just in case. ;) http://tinyurl.com/cc7yvo8
> >
> >
> >
> > <http://www.ebay.com/itm/Ceramic-feedthrough-capacitors-330-pF-Set-of-150-New-/350716024069>
> >
>
> Nice. 330 pF is a bit on the small side for a feedthrough, though--my
> 15 nF ones are enough to nuke anything above about 1 MHz.
John Larkin
May 18, 2013, 10:15:25 AM5/18/13
to
says at the very top
GaAS MMIC SP8T SWITCH NON-REFLECTIVE DC TO 2.0 GHz
Their definition of DC here is about 100 MHz.
That bit me pretty bad once. Weird folks, Hittite.
--
John Larkin Highland Technology Inc
Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Photonics and fiberoptic TTL data links
Michael A. Terrell
May 18, 2013, 10:46:53 AM5/18/13
to
John Larkin wrote:
>
> On Sat, 18 May 2013 01:53:09 -0400, "Michael A. Terrell"
> <mike.t...@earthlink.net> wrote:
>
> >
> >Phil Hobbs wrote:
> >>
> >> On 5/17/2013 10:46 AM, Michael A. Terrell wrote:
> >> >
> >> > Phil Hobbs wrote:
> >> >>
> >> >> I bought a lifetime supply of 15 nF feedthrough caps from Lithuania, for
> >> >> about 6 cents each. Then recently I bought another lifetime's supply,
> >> >> just in case. ;) http://tinyurl.com/cc7yvo8
> >> >
> >> >
> >> >
> >> > <http://www.ebay.com/itm/Ceramic-feedthrough-capacitors-330-pF-Set-of-150-New-/350716024069>
> >> >
> >>
> >> Nice. 330 pF is a bit on the small side for a feedthrough, though--my
> >> 15 nF ones are enough to nuke anything above about 1 MHz.
> >
> >
> > 1 Mhz is still DC, to some people. ;-)
>
> Hittite makes some absorptive analog mux's, HMC183 series, where the data sheet
> says at the very top
>
> GaAS MMIC SP8T SWITCH NON-REFLECTIVE DC TO 2.0 GHz
>
> Their definition of DC here is about 100 MHz.
>
> That bit me pretty bad once. Weird folks, Hittite.
would have been overkill. :)
I don't remember what Microdyne used, but early receivers had over a
hundred. The synthesizer had 24 alone.
asdf
May 21, 2013, 6:26:22 AM5/21/13
to
On Thu, 16 May 2013 21:07:49 -0400, Phil Hobbs wrote:
> Any other good post-Soviet (or other) component sources we should all
> know about?
http://stores.ebay.com/SOVCOM
> Any other good post-Soviet (or other) component sources we should all
> know about?
http://stores.ebay.com/valtek-2005
http://stores.ebay.com/URALS-SHOP
I bought some good parts from most of them. All but tunnel diodes
worked great, though having zero experience with them it could well
be my fault. Also got a couple really accurate and sturdy 200uA panel
meters that unfortunately went out of stock almost immediately.
Those IN-9 nixie meters are pure porn.
Someone made a nice looking kit, albeit too pricey IMO.
http://nixiekits.eu/IN9-VU.htm
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