>
>> You have me curious about something. I recently fired up my old Heath
>> SB-1000 after it sat idle for about six years. It was fine when put in
>> storage, but when powered up, the 3-500Z lit up like one of those Radio
>> Shack globes with the "lightning" effect. I replaced it and all was well.
>>
>> My question is, has this tube gone permanently bad or could it be
>> revived with carefully controlled "gettering"? I have a suspicion if
>> there is that much gas in there, it's gone for good. Any one have
>> experience of this sort?
>
>If you can heat the anode by running the tube at low anode voltage
>and forward grid bias, and let it cook, sometimes they will getter
>out the gas.
>
>I've been successful quite a few times doing that with old 3-500Z's
>that weren't too badly gassed.
>
>Another way to getter the tube is through a current limited arc.
>Sometimes that's done with new tubes. I haven't tried that myself.
>
sea stories
end
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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