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12BH7 preamplifier

LPD

LPD

AK Subscriber
Subscriber
Picked up this tube preamplifier awhile back. 12BH7 linestage and 12AX7 phonostage. Looks made in Japan but operates fine on 120v. Needed a few caps replaced, filament circuit and warmup relay. Never tried the 12BH7 tube before but it’s decent in this circuit.
 

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It would be a good idea to check the filament voltage, if it's still wired for 100V input as the case indicates it might seem to work fine but the tubes likely won't last long with 20% over voltage.
 
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