• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

12AU7 -> 12BH7 Do I need to change Rp?

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Well..

Thanks...

I do not open it yet because I need a special tool. So, I did not know its exact values of resistors.
(star wrench)

How about this? 12AU7 is used for PI of 6V6PP. If I feel 12BH7 better than 12AU7, I will abolish all 12AU7s in my system.
 
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