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Re: is this tube good for a VTTC?

Excuse my ignorance, but are you talking about vacuum tubes on this thread?

If you are, I have five differently sized vacuum tubes from an old
reel-to-reel tape recorder
that look really complicated inside, possibly tetrodes or pentodes. I think
they are fairly modern (for vacuum tubes). Are these useful in any way? And
how do I find out what they are for sure?


Alan Williams