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but yes

I haven't listened to different volume control resistors. My electrical theory supports your observation that 10K sounds better than 100K. Below that, other components within the amp are likely to have greater noise contributions than the volume control.

The problem with a bias current of 30-100mA is that it leads to higher power dissipation than can be handled by small-signal transistors designed for good audio performance. One can lower the supply voltage to reduce dissipation, but headroom is also reduced.

The noise effects we're discussing are very small. 100dB S/N ratio is 1 part noise in 100,000 parts signal. A great amount of care is required in circuit design and layout to keep noise below this level. Yes, tube amps have output transformers near power transformers, but at the same time, tube amps are generally not known for low hum and noise.

(Anecdotal evidence: I was once working on my Infinity speaker crossovers and discovered that just placing the soldering gun near the inductors could induce enough current for a loud hum from the woofer. And this was without any amplification!)
Ed


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