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I wound up junking the set soon after that, as I was in no position at the time to look around for a used tube. Too bad, since the Microgrid series was one of Philco's best b&w TVs of the 1950s, with a cascode tuner and an excellent sound system. I was surprised the set didn't have a phonograph pickup input on the rear of the chassis--that's how good the sound was. I had a Zenith K-2739 1963 b&w 23" TV with a good audio system as well, but that set did not have a phono input either; why, I'll never know, since the set had a 6BN6 gated-beam audio stage, 6BQ5 output and a 6x9 oval speaker in the base of the cabinet, below the CRT. That TV easily had the best mono sound system of any set I owned before or since then, although today it is possible to connect a flat-panel TV to a stereo system and have better sound than even the best mono TV audio systems produced 50-60 years ago.
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Jeff, WB8NHV Collecting, restoring and enjoying vintage Zenith radios since 2002 Zenith. Gone, but not forgotten. |
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if it is the original tube...it should be a 21CYP22 and those are NOT real common !! I agree...wrap several layers of tape around it and get it secured. Get the set working good and THEN...maybe worry about the base. I had a CTC-5 with a tube with a similar base ...and it ALSO had like--new readings on ALL tests--life, emissions, cutoff AND gun balance. I was just VERY careful with it....it was fine..
UNLIKE..the last 21AXP22 set I came across. that base was PERFECT...but the tube was STILL full of AIR... shame--since it HAD shown good supposdely--the last time the set ran...about 40 years ago or so !! I guess all of that "idle time in a basement"....took its toll on the seals. I ALSO have a number of thsoe Zenith sets...with 6BQ5 audio amp and a couple of them have a 10" speaker and an electrostatic tweeter I believe !! I expect the size of the OPT and B+ on the tube means it could give about 5 watts of power or so...not sure it is really enough to push that big speaker to its full potential though. ONE of them is a 23" set with a weak tube and it WILL produce a raster ...b ut there are bad caps and something is smoking near the cap by the 6BQ5. The other one is a 24" set with a decent tube accd. to my 70. It preduces a pretty good raster....with some foldover--and a big cap by the tranny is geting warm...so I know it TOO needs caps. Both are 1958 sets I beleive..one is an SC400. I have a couple of others wiht the 6X9 speaker and 6BQ5 amp. I KNOW they have very good sound !! |
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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
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