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Has anyone had to replace the FETs tied to the cathodes of the EL84's in one of these amps? The auto bias will not function on the two inside tubes. A static check with a meter shows one of the 4 FET's is bad. Without a schematic I don't know what other components are tied to these components. Mouser has the FET's but I don't know if I may need to replace something else. This circuit is new to me.