I received a spare tube as part of a recent amp purchase and am wondering if
it is a usuable sub for a 4cx1500b or 4cx1000a. The tube is labeled Y-757,
but I cannot find any tube reference on several internet sites. I have
posted
the question on the collins reflector and have received some info, but no
hard confirmation. Eimac has not responded to my query to date. Any info on
characteristics would be helpful.
Thanks for your attention.
Terry Connor
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