800B Audio Output Circuit

[Joseph W Strickland]

I have studied the audio output circuit of the 800B. I determined that there is negative feedback using R89, a 1 meg.ohm resistor from the plate of V20 back to the plate of V19A. Each 6L6 is drawing about 40mA. Although the rated power output is said to be 25 Watts, there is nothing said about the THD or IMD of the amplifier. Have any of you measured some of these to get a consensus of how much distortion they typically generate?

Joe