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Re: The Convention Wisdom / Thought Is....

Not always. I meter everything and have consistently found that most tubes run 'high and cold' compared to classical op points show more of the least objectionable 2nd harmonic distortion and greatly reduced distortion compnents above the 3rd or 4th. It's almost certainly the reason for sounding less strained. The effect is easy to see on a spectrum analyzer. Within reason a side benefit in output stages is the increased grid bias means greater plate swing and increased output, which can be traded off with a higher turns ratio OPT for any even greater reduction of upper distortion components. Meters are the reason I end up running oddball points like a 6CW5 SE at 260 B+ and ~35ma into a 5k OPT instead of the classical ~150 VDC at 75ma. And yes, along with reducing the DCR in the PS, to my ears it results in terrific sounding amp.


Thermionically addicted.


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