Quote:
Originally Posted by andy
I've had some success repairing open heaters by zapping them with a high voltage source. A neon sign transformer seems to work well (60Hz iron type, not electronic). It has enough current to weld a small gap, but not nearly enough to burn out the heater. It often takes several tries before it will hold, so don't give up if it doesn't work at first.
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I tried that using a Zenith color as a source. B+ nothing, 1+KV boost nothing, damper lead that killed a DMM I once touched to it by accident....That made a nice consistent blue arc inside the CRT, but nothing like a weld (even with banging on the neck)...That tube is toast.