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Re: Legacy 300b with CCS

The gain and operating line (which sets the distortion character) are determined by the plate load resistance for a pentode. A CCS improves distortion for triodes, but generally not pentodes.

Without a CCS, the driver stage has little power supply rejection, so a quiet power supply is necessary. Sounds like yours is excellent, especially when you improve the 200uF cap.

It will, in my experience, take something like 50 hours of music before the capacitors and output transformer settle down - if you have only a few hours on the unit, that may be the source of the "haze" you hear. Normally I hear a significant change after the first 10 hours, but that depends on the particular components and on the signal level so it's not an exact science (!)


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