https://wiki.johnharrison.cc/ 2026-05-01T16:00:58+00:00 https://wiki.johnharrison.cc/ https://wiki.johnharrison.cc/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2020-12-06T12:54:06+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.johnharrison.cc/doku.php?id=audio:mcintosh:mc240&rev=1607259246&do=diff Function * MC30 thru MC275 all, if you have increasing distortion as the volume is increased check the second stage, V2, 12AU7 Phase Inverter, pins 1 and 6 must be at the same voltage (265V), if not replace the .22 uF capacitor on pin 7. The grid bias is derived from a 2.2 M ohm resistor, if this capacitor as any leakage it will upset the bias voltage resulting in the phase inverter outputs being unbalanced.