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Grid Stoppers MUST be Carbon Comp

The grid stoppers MUST be carbon comp. I can't stress that too strongly. You may also need to cut open a sample to be sure the ones you buy are really carbon comp. Manufacturers have been cheating for at least the last 20 years; many "CC" resistors are actually spiral-wound carbon film. That entirely defeats their purpose for this use.

An effect sounding like excessive sibilance can also be caused by intermodulation distortion. Pentodes generate a lot of that, although it's not usually a problem in UL mode. Just be sure the external NFB loop is working as intended.


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