I'll look for the list of 7360 electrically replaceable tubes. There weren't that many, maybe 2 or 3. I seem to remember spending an entire hamfest season several years ago searching for these replacements and only finding a few. Never had a hum problem with the 7360's but component values were very critical in order for the circuit to work properly.
Pete, WA2CWA ps To All: Sorry for the earlier multiple posts. I didn't see my first post go through, and rather than being patient, I resent it two more times in the course of 12 hours. On Sat, 08 Nov 2003 20:26:27 +0000 "Donald Chester" <[EMAIL PROTECTED]> writes: > > > There are several beam defection tubes in circulation during > >the 60's time frame. Unfortunately, none of them are directly > >interchangeable with each other unless one is willing to rewire > several > >pins on the tube socket. Spec wise they are very close to each > other. > > If anyone has the data, maybe you could post a list of all the > beam > deflection tubes of that era. I think they were widely used in > tube-type > color TV's. Sometimes the TV ones are cheaper than the 7360, but > on the > other hand, the cheap sweep tubes of the 60's now cost several times > more > than 6146B's. > > One problem I had with the 7360 was that the a.c. filament current > would > introduce hum into the circuit. The magnetic field from the > filament would > modulate the beam deflection enough to modulate it slightly at 60~. > I am > sure this was never a problem with the slopbucket rigs of that era > since > everything below about 500~ was rolled off anyway to produce > "communication > quality", but it was certainnly noticeable in my homebrew SSB > generator. Of > course there is a very simple fix: use reasonalbly well filtered DC > on the > filament. I have found that to be necessary even with the 12AX7 1st > > amplifier stage of my mic preamp. ________________________________________________________________ The best thing to hit the internet in years - Juno SpeedBand! Surf the web up to FIVE TIMES FASTER! Only $14.95/ month - visit www.juno.com to sign up today!
