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A problem with these circuits is that when the set is first turned on the filaments take a real "hit". You can see them light up very bright for a second. That really hurts the life of the tubes. Not too big a deal with most of the tubes, since they are cheap, but the crt would be hard to replace. Not all that many were made to begin with in the 8" size. I will say, so far every 7" electrostatic tube I found was still good. There are ways you can rig that set to be easier on the filaments-you can worry about that later.
Banderson did a better job of telling you how to test it than I would have!
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Bryan
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01-13-2011, 10:33 PM
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