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5E3....you could change the bias on that first tube by changing the resistance on the cathode bypass. You could also affect the gain there by changing the value of the bypass cap. You could change the output to a fixed bias. You could change the bias on the power tubes by increasing the resistance of the bias resistor...this will 'clean' the signal up.
FWIW, I know of a 5E3 that is too clean for my tastes. The fellow who owns it likes it that way. He doesn't push the amp into distortion at all. When pushed to distortion, his amp doesn't break up smoothly....it has a jagged edge to the distortion that is non-musical to me. HE never encounters this because he plays at such a volume that nature of the distortion is of no concern to him. IT is the only 5E3 that I have ever heard that acts this way.
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