Have you actually tried this one ? There are tons of so called part brokers on the web. Most are useless, even if you're a manufacturer. For hobbyist they're especially useless.
I thought I had some, but they ended being UHP408 chips. The prefix does suggest Sprague. Have you tried Allegro ? That's the name they last operated under.
I wouldn't say they are totally useless. Mostly, yes. But sometimes you can achieve nice results. Recently I got a new in box NL-7094 via one of those brokers. But that is after emailing hundreds of suppliers... ;-)
> Have you actually tried this one ? There are tons of so called part > brokers on the web. Most are useless, even if you're a manufacturer. > For hobbyist they're especially useless.
> I thought I had some, but they ended being UHP408 chips. The prefix > does suggest Sprague. Have you tried Allegro ? That's the name they > last operated under.
> On Tuesday, October 2, 2012 5:33:06 AM UTC-7, glasslinger wrote:
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On Wednesday, 3 October 2012 10:38:35 UTC+1, Jens Boos wrote: > I wouldn't say they are totally useless. Mostly, yes. But sometimes you > can achieve nice results. Recently I got a new in box NL-7094 via one of > those brokers. But that is after emailing hundreds of suppliers... ;-)
About 10 years ago I bough two NIB 7094s for about USD 5 !
Unfortunately, they were RCA 7094s - RF power output pentodes!
The upside was they are actually very valuable too, so whilst I don't do power RF stuff much, the tubes are worth perhaps USD 100 each now and are still in big demand.
> On Wednesday, 3 October 2012 10:38:35 UTC+1, Jens Boos wrote:
> I wouldn't say they are totally useless. Mostly, yes. But
> sometimes you can achieve nice results. Recently I got a new in
> box NL-7094 via one of those brokers. But that is after emailing
> hundreds of suppliers... ;-)
> About 10 years ago I bough two NIB 7094s for about USD 5 !
> Unfortunately, they were RCA 7094s - RF power output pentodes!
> The upside was they are actually very valuable too, so whilst I don't > do power RF stuff much, the tubes are worth perhaps USD 100 each now > and are still in big demand.
> Got me interested in RF design though....
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>> About 10 years ago I bough two NIB 7094s for about USD 5 !
>> Unfortunately, they were RCA 7094s - RF power output pentodes!
Released by RCA Jan 20, 1958 Heater 3.2 amps (later 2.85) at 6.3 Volts. DC plate volts 1500 Continuous service, 2000 intermittent service. Plate dissipation 100 or 125 Max Watts.
"High power Gain, ... in fixed and Mobile equipment as as an RF power amplifier and oscillator as well as an AF power Amplifier and modulator.. Full power at 60Mhz and reduced input up to 175Mhz."
Stands five inches high from pins to Plate connection, and 2.56" maximum diameter. Jumbo 7 pin base with Pin 4 larger than the rest.
Yes, that is a bit different from an IC or a Nixie tube
-- Charles MacDonald Stittsville Ontario
cm...@zeusprune.ca Just Beyond the Fringe
http://users.trytel.com/~cmacd/tubes.html No Microsoft Products were used in sending this e-mail.
>>> About 10 years ago I bough two NIB 7094s for about USD 5 !
>>> Unfortunately, they were RCA 7094s - RF power output pentodes!
> Released by RCA Jan 20, 1958 Heater 3.2 amps (later 2.85) at 6.3 > Volts. DC plate volts 1500 Continuous service, 2000 intermittent > service. Plate dissipation 100 or 125 Max Watts.
> "High power Gain, ... in fixed and Mobile equipment as as an RF power > amplifier and oscillator as well as an AF power Amplifier and > modulator.. Full power at 60Mhz and reduced input up to 175Mhz."
> Stands five inches high from pins to Plate connection, and 2.56" > maximum diameter. Jumbo 7 pin base with Pin 4 larger than the rest.
> Yes, that is a bit different from an IC or a Nixie tube
> WOW! Who's complaining? Build yourself a nice little CW transceiver or > linear amplifier.
> Those old power pentodes are getting scarce. :(
> -Adam
> On 10/3/2012 1:50 PM, Charles MacDonald wrote:
>> On 12-10-03 11:30 AM, jb-electronics wrote:
>>>> About 10 years ago I bough two NIB 7094s for about USD 5 !
>>>> Unfortunately, they were RCA 7094s - RF power output pentodes!
>> Released by RCA Jan 20, 1958 Heater 3.2 amps (later 2.85) at 6.3 >> Volts. DC plate volts 1500 Continuous service, 2000 intermittent >> service. Plate dissipation 100 or 125 Max Watts.
>> "High power Gain, ... in fixed and Mobile equipment as as an RF power >> amplifier and oscillator as well as an AF power Amplifier and >> modulator.. Full power at 60Mhz and reduced input up to 175Mhz."
>> Stands five inches high from pins to Plate connection, and 2.56" >> maximum diameter. Jumbo 7 pin base with Pin 4 larger than the rest.
>> Yes, that is a bit different from an IC or a Nixie tube
> Somehow I missed the part where they're full power on the 6m band and
> partial power on 2m. Sounds like some nice finals to me.
My handy reference on tubes is from the tube collectors association (one of the best 50 bucks spent on information) and includes the "Original" data on most types, sometimes there is changes on later versions.
-- Charles MacDonald Stittsville Ontario
cm...@zeusprune.ca Just Beyond the Fringe
http://users.trytel.com/~cmacd/tubes.html No Microsoft Products were used in sending this e-mail.
On Thursday, 4 October 2012 00:20:54 UTC+1, charles wrote: > On 12-10-03 07:06 PM, Adam Jacobs wrote: > > Somehow I missed the part where they're full power on the 6m band and > > partial power on 2m. Sounds like some nice finals to me.
> My handy reference on tubes is from the tube collectors association (one > of the best 50 bucks spent on information) and includes the "Original" > data on most types, sometimes there is changes on later versions.
> ...or you could just use Frank's pages, which are wonderful, and free!
They are indeed lovely tubes, which is why I haven't sold them. I have a collection of large power pentodes etc. of which the 7094s are amongst the smallest, but I don;t feel the need to build RF kit... some of the Russian ones are lovely - This winter I'll be building an amp based on 6C33Cs - one of my favourite output triodes...
Having said that I've just built two "pantry" AM transmitters so that we can enjoy the various valve ("tube" to our US cousins) radios which tend to be AM (MW/LW/SW) and sometimes FM (VHF) - for the VHF I'll have to build a small (<100mW) xmtr so that I can use all wavebands).
Back on topic slightly, I've found that multiplexed nixie clocks interfere terribly with old valve AM radios, partly because the radios have poor selectivity, but also due to the wide spectrum of near-field interference that poorly screened uP projects emit... AM is of course extremely vulnerable to this type of interference.
Are you sure that it is the multiplexed nixies and not the switching supply? I'm just curious at this point, I've always assumed that the rapid ionization/de-ionization of the neon would create some RF noise, but no real idea. When I built my WWVB nixie clock, I shut down the HV supply (and then also by definition the nixies) while listening for timesync.
> Back on topic slightly, I've found that multiplexed nixie clocks > interfere terribly with old valve AM radios, partly because the radios > have poor selectivity, but also due to the wide spectrum of near-field > interference that poorly screened uP projects emit... AM is of course > extremely vulnerable to this type of interference.
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> ...or you could just use Frank's pages, which are wonderful, and free!
I often use those also. The Data from the TCA is actually a scan of the entire registration file from the RMA, RTMA, EIA, JEDEC and a few other names that the used over the years. each file Generally has the Official Data sheet, and sometime back and forth between the various makers as they wanted to change the specs to conform to what they actually produced. It also included the same information of the 1nxxx and 2Nxxx semiconductors.
The TCA folks did a nice index which lets you see when the "release" went out as a mailing to the rest of the industry. This is sometimes not the date that the tube was actually first available as the makers would try to get a "Socket Win" from Receiver makers in advance of letting their competitors what they were planing to come out with.
-- Charles MacDonald Stittsville Ontario
cm...@zeusprune.ca Just Beyond the Fringe
http://users.trytel.com/~cmacd/tubes.html No Microsoft Products were used in sending this e-mail.
