[Ron Ramirez]

Okay, this is really getting weird...

I doublechecked my connections and all are correct. I replaced the 8.2K 1/4 watt resistor with an 8.2K 1/2 watt resistor just for fun.

I then hooked everything back up and, after letting the TA-600 run for a few minutes, I found that the millivolt readings across each 10 ohm cathode resistor are changing with rotation of each respective trimpot. However, I'm not getting readings anywhere near 34 mV. More in the range of 330-370 mV on V15-V16, and 190-230 mV on V21-V22.

These readings were made with the original, old, weak 7189s still installed. I don't want to put the new 6П14П-EB tubes in until I know this IBAM circuit is going to work correctly.

I'm beginning to suspect my meter is not giving accurate readings in the millivolt range.

I'm going to ask a friend to bring over a known good meter this weekend, and we will try it again.

Otherwise...I found that the distortion went away after it played for a few minutes, and the left channel difficulties have returned but now seem associated with either the Selector switch, the Mono-Stereo switch, or both. I'll clean them again.

I'm going to recheck the voltages Mondial asked for and report back later...