I'm still interested in switchable cold clipper on my AB165 Bassman, but I don't want to change the appearance of the amp, so I have a new plan: Replace the 1.5K cathode resistor with a 1.8K, leave it connected to the cathode but put the ground through the SPST Deep switch. Tie a 10K to the cathode direct to ground. Now with the switch in the up position, the only path to ground is through the 10K. With the switch in the down position the 1.8K and bypass cap go to ground. The 10K is never disconnected (no pop) and 1.8K + 10K in parallel = 1.525K Ohm -- pretty much stock. Whadda ya thinK? EDIT: sketch say V3, but I meant V2 which is the third gain stage.