Antique Philco 37-665 audio output problem

[walterbeers]

An update that I found, if I disconnect C60 .01uf (mistakenly labeled on the parts list as #59) the distortion, and popping disappears however the volume is lower. and the lower 6F6 (on the schematic) really isn't doing anything, other than conducting and getting warm (not overly warm). Seems as if the signal for the control grid of the lower 6F6 is getting it's signal from the screen grid off the upper (on the schematic) 6F6. Bias at each control grid of each tube runs just over -3 volts, which looks about normal to me.