Cathode Bias or fixed?

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To my knowledge all the Egnater and Randall modular amps are fixed bias hence the test points and adjustment on the back. For RM20/22 you’ll use EL84 and bias between 15-20mV.

A cathode bias amp would be something like a Vox AC30, Fender Blues Jr, etc.

I wouldn’t necessarily say one is more popular than the other as you can find many examples of both.
 

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