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Through the years I have often wondered if a tube with one letter difference could be at least usable as a replacement, but 9 times out of 10 it is out of the question. There are subs, or what could be used as subs with some circuit changes, but they sure don't go by the alphanumeric sequence. It would be nice if they did.
If you can ever get hold of a Sylvania or RCA tube guide from the 50s like I have, you will have an invaluable resource. I'm not so sure how hard they are to find these days.
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"Face piles of trials with smiles, for it riles them to believe that you perceive the web they weave, and keep on thinking free"
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