Quote:
Originally Posted by droptop
the reference to “waking up” the CRT. Is there a thread covering this subject?
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Operating a CRT filament at rated voltage for extended periods (days at a time) will sometimes bring a 'sleepy' CRT back to full emissions, which is what I usually try before heading into the cleaning or rejuvination modes on testers. The theory is the cathodes lose some emissive capability after not being operated for a few decades, so getting the cathodes good and hot for a while will sometimes bring a seemingly dead tube back to life. Regular use typically makes them better with time as well, though it's a 50/50 shot. Seems to me most tubes from that time were ran into the ground though, I have 3 duds in my bedroom right now that won't come back no matter how many times I rejuve them. Shame too, a 21CYP22A I have has perfect emission on 2 guns, but blue is totally defunct.