• 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.

If I change B+ do I have to change the circuit?

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Yes, although it depends on what the circuit is supposed to do. If a guitar FX box you will just get slightly different FX. If a hi-fi preamp you will get a bit less gain and a lot more distortion. 12AX7 like a high resistance in the anode circuit, which means either high HT/B+ or an active load.

Thank you for your quick reply. would the changes be in the power supply or in the amplifier circuit?

thanks
 
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