Quote:
Originally posted by jstout66
have you checked EVERY tube in the set and replaced ALL bad ones yet?
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I found only two zenith tubes in the set, so most have been changed in the past. I've changed more than half of tubes. The B+ is good, so I left the two LV rectifiers in there. Same goes for HV... it's healthy as well. I didn't have the verticle or demodulator tubes, so those haven't been swapped yet. Everything else has been changed.
My tube tester is an old NRI unit... probably from the late 40s or early 50s. It works great, but doesn't have listings for any of the more "modern" tubes used in the 60s. In those cases I just swap it out with a known good one to see if there is any improvement.