• 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.

Swap EL34 with 6L6 or 6V6

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jazbo8 said:
Yup, it looks like a Chinese-made hi-fi amp, so unless you want to drill some holes and install more parts, it might be easier to drive it with a preamp with tone control. I don't think you want to overdrive the output stage to get more "crunch" which is a term commonly used when talking about guitar amps.

But if you are good with DIY, you can try the variable bias scheme as shown below, which allows you to set the bias for the output tubes accordingly:

View attachment 541916
Click to expand...

hi Jazbo, it's so beautiful a solution that change the resistor with Potentiometer. I will try it but before than these modifications I am changing the tubes. already bought russian made 6SL7 and 5C3S tubes instead of chinese. Also will buy USA made 6L6 tubes but just waiting the result of this subject 🙂

thanks
Tanzer
 
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