Frequently Asked Question

I replaced the tubes but they don't seem to be working?
Last Updated a year ago

Question: I replaced the tubes but they don't seem to be working?

Answer:

It means that at least one of the sections of one of the tubes has a bias outside the design window and cause DC to appear at the output. It is a protection circuit that prevents the unit from turning on and outputting DC. If the tubes pass correctly (bias, anode current, transconductance) on a tube tester they should work. It may be possible to identify the bad tube (it is likely only one of them) by swapping back in one of the original working tubes and then fitting the suspect tubes one at a time.

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