Hello Mates - Recently I bought a BHK Pre and BHK 250 combo. Now want to roll the tubes of pre and found a NOS GE 12BH7 in my local old tube shop. The person told me, I can use 12BH7 instead of 12AU7 in my BHK pre. Now, I need your expert suggestion should I use it? Any one as any previous experie…

I don’t know that tube per se (preferring to stick with the stock tube) but it will work. BHK preamp has the ability to switch heater currents via a jumper inside the preamp. You can go from the standard of 4ma to 5ma. If you can find out the appropriate current the tube wants, use this jumper to s…

BHK Pre Tube Rolling (using 12BH7 instead 12AU7)

Audio Components Preamplifiers

dawkinsj January 22, 2024, 4:32pm 9

Here you go.

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BHK Pre Tube Rolling (using 12BH7 instead 12AU7)

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