What is a 7360 Tube?
John Goller, K9UWA
Ham rig...and one he asked about is a 7360.....I don't see any listing in my
books for it......all old books..........hope it is a cross to something
common??
thanks
John k9uwa
Robert Mozeleski
basing 9KS
Miniature 2 plate beam deflection tube. Useful in SSB equip.up to 100mhz
"John Goller, K9UWA" wrote in message > One of our locals ask me for a few
Bill Turner
disregard caps, visual problem
Bill Turner WA0ABI
1117 Pike Street
Saint Charles, MO 63301
636-949-2210 (FAX TOO)
BH
transmitters.
Bill H.
Michael Black
It was never a common tube, and you wouldn't find it in consumer
equipment. They were needed in your average piece of equipment,
and I gather carried a premium price. They pop up in
rec.radio.amateur.boatanchors and rec.radio.amateur.equipment
as part of the compaign to turn those groups into forsale groups.
People have mentioned them being used as balanced modulators
in single sideband transmitters. But they were also seen
in mixers in receivers, because they had good signal handling
qualities. At a time, forty or so years ago, when most mixers
in receivers (and transmitters) were unbalanced and used your
average tube, the 7360 was a big step up. They also gave
you, in one package, a balanced mixer, when otherwise you'd
need a couple of tubes or a dual section triode to get the
same function.
The 7360 got a lot of notice because of an article in QST back
in 1963, by Squires (or was it Saunders?), which I've never
seen. It apparently talked about how useful a tube it was,
and then at the very same time it appeared in a Suires-Saunders
receiver that was considered ahead of it's time. For the next
decade or so, you'd see all kinds of construction articles in
QST (and the other ham magazines to a certain extent) where
the 7360 was used as the mixer in a receiver.
The tube faded out when tubes faded out generally. But by
then, there were other good performance mixers, like the
diode ring mixer using hot carrier diodes, or variations
on the "Gilbert Cell mixer".
As others have said, there is no direct substitute for the 7360.
There were other beam deflection tubes that found their way
into ham equipment. The 6AR8 is the same sort of tube, and
since it was intended for use in color tv sets (I have
no idea if it was actually used in them) at least one
article suggested using it because it was cheaper.
Michael
John Goller, K9UWA
blac...@gloria.cam.org says...
>
>
>
>On 11 May 2001, John Goller, K9UWA wrote:
>
>> One of our locals ask me for a few tubes to retube his old Tempo
>> Ham rig...and one he asked about is a 7360.....I don't see any listing in my
>> books for it......all old books..........hope it is a cross to something
>> common??
>> thanks
>> John k9uwa
Thanks guys....that answers the question....now to look for one of them...
John k9uwa
Peter J. Bertini
They sell for up to 50 bucks at some dealers.
Right now, the best price I've seen is from Fair Radio,
they have some listed for 15 dollars. Remembered
someone in another newsgroup had spotted them
there.
Peter
"John Goller, K9UWA" <k9...@arrl.net> wrote in message
news:9dhbio$k...@dispatch.concentric.net...
Crazy George
different base. They were used in a few TVs, and showed up in schematics
for home-built SSB exciters in the magazines in the 60s.
W5VPQ
--
Crazy Georgenews:9dgki4$c...@dispatch.concentric.net...
Alan Douglas
Michael Black replied:
>and then at the very same time it appeared in a Squires-Sanders
>receiver that was considered ahead of its time. For the next
>decade or so, you'd see all kinds of construction articles in
>QST (and the other ham magazines to a certain extent) where
>the 7360 was used as the mixer in a receiver.
That was the SS-1R receiver, and it does indeed work very well.
The 7360 is susceptible to stray AC fields, and I'm told by a friend
who used to work at Squires-Sanders that the best tubes had to be
selected from the run of the mill.
73, Alan
LGeoCole
Can't remember offhand whose, though.
George C.
wb0...@prodigy.net
Michael Black wrote in message ...
>
>
>The 7360 got a lot of notice because of an article in QST back
>in 1963, by Squires (or was it Saunders?), which I've never
>seen. It apparently talked about how useful a tube it was,
>and then at the very same time it appeared in a Suires-Saunders
>receiver that was considered ahead of it's time. For the next
>decade or so, you'd see all kinds of construction articles in
>QST (and the other ham magazines to a certain extent) where
>the 7360 was used as the mixer in a receiver.
>
>The tube faded out when tubes faded out generally. But by
>then, there were other good performance mixers, like the
>diode ring mixer using hot carrier diodes, or variations
>on the "Gilbert Cell mixer".
>
The article was by William Squires, and the receiver was the Squires-Sanders
SS-100. I've built a receiver using the 7360 mixer and it has the best
immunity to cross-modulation and the best dynamic range of any receiver I've
ever used. The 7360 was also a popular mod to replace the mixer tubes
(6BA7s IIRC) for the Collins 75A-4. It is far, far superior to diode ring
mixers or Gilbert cells. With 1 V of RF at the antenna terminals from a sig
gen I can copy a weak signal 10 kc away with no noticeable cross-modulation
or reduction in sensitivity.
There were several other sheet-beam tubes marketed for color TV synchronous
detection in the early 60s as well, but none of them shared the basing with
the 7360.
BTW unless the emission is really down to zero, I would question the need to
replace it. As stated elsewhere in this thread, Fair radio has 'em for 15
bucks - a bargain. The 6AR8 was inferior to the 7360 and the other sheet
beam tubes according to a early 60s article on converters in QST.
73 John
John Byrns
lgeo...@aol.com (LGeoCole) wrote:
> The 6AR8 showed up in one FM multiplex demodulator, too.
> Can't remember offhand whose, though.
I have seen the 6AR8 used in several different FM stereo multiplex
decoders, Altec Lansing and Knight were among those using the 6AR8 in FM
stereo decoders. I don't know if Zenith actually used the 6AR8 tube in a
production circuit, but as one of the developers of the FM stereo
standard, they suggested FM stereo demodulator circuits using the 6AR8.
Regards,
John Byrns
Surf my web pages at, http://www.enteract.com/~jbyrns/index.html
Bill Meacham
> >
> >The 7360 got a lot of notice because of an article in QST back
> >in 1963,
Didn't one of the Hallicrafters transmitters of the era use a 7360 or am
I dreaming?
--
Bill Meacham
Vieques, PR
JEP
500CX and newer used a 6JH8. A lot less expensive.
Butch in Michigan and a Swan user.
George R. Gonzalez
Apparently it wasnt terribly stable or cheap-- they came out with a plug-in
replacement module of a diode-ring design.
Most hi-falootin receivers use diode-ring mixers, mainly cause they're
pretty good performers. The downside is they need a LOT of oscillator drive
signal, something that the 7360 didnt need as much of.
Brian McAllister
Spencer, NC. Kirk Cline in Greensboro had them for $30 (NOS RCA) I
have his email address somewhere.
On Fri, 11 May 2001 19:31:56 GMT, "Peter J. Bertini"
<radioco...@home.com> wrote:
>John, it is a special balanced modulator tube.
>They sell for up to 50 bucks at some dealers.
>Right now, the best price I've seen is from Fair Radio,
>they have some listed for 15 dollars. Remembered
>someone in another newsgroup had spotted them
>there.
>
>Peter
Brian McAllister
Durham NC
kc8adu
factory but who knows.
Adam Vaughn
or other tube? Just wondering...
-Adam
Adam Vaughn
Collector of old computers, video game systems, radios and other electronic
equipment...
Visit my page at
http://www.angelfire.com/ma2/AdamVon/index.html
John Byrns
adama...@aol.com (Adam Vaughn) wrote:
> A bit OT, does anyone have a schematic for a tube FM multiplexer using a 6AR8
> or other tube? Just wondering...
> -Adam
Hi Adam,
There is a diagram of the Zenith Multiplex circuit, using a 6AU8 and a
6AR8 tube, in the August 1961 issue of Audio Magazine. Schematics of the
Altec Lansing and Knight adapters are in the book "FM Multiplexing for
Stereo" by Leonard Feldman. Both of these also use the 6AR8 tube, with
the Knight being a commercial implementation of the Zenith circuit. If
you want something better, the schematic for the H.H. Scott 335 Multiplex
Adapter can be found on my web page. The problem with home building any
of these circuits is finding the needed coils. Also alignment can be a
problem if you don't have a multiplex generator for alignment. If you
want I could hook up my scanner and scan the Zenith and Knight circuits
for you. Drop me an email if you are interested.
CClay51032
The EICO 753 has a 7360 in it.
WA5MZO
JEP
Butch in Michigan
kc8adu <nos...@spam.sucks> wrote in message
news:tfrac7r...@corp.supernews.com...
BensRadios
it's variations are 6AR8, 6JH8 and 6ME8
Ben
Jim Adney
>The EICO 753 has a 7360 in it.
What kind of device was the EICO 753?
-
-----------------------------------------------
Jim Adney jad...@vwtype3.org
Madison,Wisconsin USA
-----------------------------------------------
Bill Meacham
Jim Adney wrote:
>
> cclay...@aol.com (CClay51032) wrote:
>
> >The EICO 753 has a 7360 in it.
>
> What kind of device was the EICO 753?
>
>
An experiment utilizing an unstable and drifting VFO. Eico called it a
SSB transceiver.
-Bill WX4A