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    Mismatched tube impedence-can I use in parallel?

    I have picked up a surplus amp ( I think military) that had twin 4-250A tubes run in parallel. I plan to rebuild this amp using these two tubes, and repair and modify it to run in AB1, grid driven. The problem I have is that one tube is an Eimac 4-250A, the other is a Penta Laboratories 4-250A...