The schematic labelled "72 Graphic MKII" has a 15K cathode resistor in the gain stage BEFORE the PI. I believe that's the one he was referring to. It's this circuit: http://www.orangefieldguide.com/OFG_SCHEM/OR120schem_72.gif" onclick="window.open(this.href);return false; Ah; I was using this schem...

it requires extra components - a 0.068uf capacitor, 1Meg,100k and 15k resistors (you don't need to get a 1k5 resistor as you replace the 1k5 cathode resistor in the previous gain stage with 15k. Hey Jon, can you please elaborate on the 1k5 to 15k cathode resistor? The schematics I found don't menti...