Doc and Paul you have commented on this , perhaps Paul B might help on this latest post. I have about 20% drive ac out of the .47 coupling cap, as compared to the working amp. Each of the amps are wired as parafeed, with a c4s , as suggested in the C4sing the sex amp, in the old valve issue. I have checked the cap and the connections from the input half of the 6dn7 which goes of course to the output in parellel at pins 1,2,3. I have bent the connections in the tube sockets and checked if any of the 9 pins are shorted somehow.i have checked each wire connecting the tubes to see if any are shorting.. all voltages are the SAME ,as the working amp. including the output of the C4s which is right on at 250V Only difference is the attenuated AC voltage At the screen pin 1 in the amp that just whispers. please note the one amp works perfectly, and I have tried everything I can think of. Do you think I should replace the tube sockets? Or What?? Please take pity on me and help if you can. PS DOC these are NOT the amps i am giving you. Jan Olsen