Nevertheless most commercial Amps have much lower bias current to avoid high power usage and high temperatures.
Probably part of the reason there distortion numbers aren't great.
May be i'm trying to reduce to 15mV/0.22R and checking the effect to THD+N on my usual output requirement
I've found bias can be run down to about 18mV with no real issues. But distortion increases rapidly below 15mV. My recommendations would be to stick with the numbers in the build guide ~20-22mv across a single emmiter resistor or ~40-44 from TP-101 to TP102 as per point 21.B of the build guide.
