I just fired up my new build and all is functioning except the trem. Im using ½ a 12ax7 into cathode biased 6v6s. (Only) the trem portion of the below schematic is what I used in mine. http://www.schematicheaven.com/bargainbin/kalamazoo_reverb_12a.pdf I tried it as is, and also with a 1.5k cathode resistor/100u cap combo. The grounded cathode setup resulted in the -.05vdc on the grid and about 106vdc on the plate. This matches the voltages Ive seen on other links for this same design. The cathode resistor strategy resulted in 130vdc on the plate along with 1.0vdc on the cathode so I know the triode is conducting. I tried connecting the switch jack directly to ground (on) and cannot see any trem-oscillation occurring anywhere in the setup. I havent scoped it yet (different room) but my fluke usually shows AC even if very low hz like trem. I hear no effect at all at any setting. I also tried another new tube that I know functions. I'm not seeing dc leaking thru the caps on the plate. Trem/controlled oscillation remains a mystery to me when trying to fully comprehend a schematic. Should I try going to .01 instead of .02 somewhere? Maybe its too slow? Any hints?