Home › Forums › The Lounge › 12bh7 causing hum in Dynaco ST-70

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  • May 24, 2016 at 6:16 pm #84406
    Paul G
    Member

    I recently built a Bob Latino ST-70 stereo amp kit. It sounds great but when I replaxed the 12au7 driver with an EH12bh7 it produced a hum. None of the different 12au7’s have done this. Lots of people seem to like this the 12bh7. Just wondering if anyone has had this problem?

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