Thanks for the response Fletchj. Unfortunately the amp is a custom job so I can't know for sure. I just purchased some additional 12AU7A's so at least I can try all the same type. While I'm at it, how interchangable are 5U4GB's and 5U4G's (I know the amp originally had 2 5U4GB's as rectifiers but I have been advised that 5U4G's are fine to use as well).
Thanks again,
Eric
Thanks again,
Eric