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Questions about tubes and gear that glows. FAQ

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Newbie question...

Posted by Ken on October 5, 1999 at 10:05:44:
Just a newbie question: Can different power tubes be mixed in match pairs on the same amp? ie, if a stereo amp has 4 6550's (2 per side), can we use 1 Kt88 and 1 6550 per side in it?
Thanks,
Ken.