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Re: 12BH7's are the same as? need some help please

Mang, hi. 12BH7 does not have an industrial/military equivalency as far as I know. These are being used in your amp as phase splitters I would guess. A similar tube is the 6CG7/6FQ7. If I were you I would ditch the EH 12AU7 tubes and try some NOS or good OS. There are plenty of choices. First on my list would be some mid 60's RCA 5814. Do some research via Duncan Amps site on the WWW. Next, I would find out if I could use JJ KT-77 in place of the 66 - unless you happen to be using OS. If you are handy with a soldering iron how about upgrading the coupling caps? The power supply is another area. Fairchild Stealth diodes will make a vast and superb improvement. Tube rolling only scratches the surface.


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