Not sure about long leads on R18s. You may check the actual buffer offset that's causing the relay trips by measure OG vs the channel input pins on the relay. I'd tack little wires there for the test.
Maybe IG -> PCB will help. Also consider searching orig "A Very Compact.." thread for cycle, cycling, latch for other idea.s
IG -> PCB definitly helped. The amp lives and plays music quite nicely! The latching is a little finicky right now. Right now, the long wires exist, but are not connected to anything, so the amp is works (gentle hum) with my ER6's. I haven't try anything else yet, but with R18=120 ohm, if I brush the amp or anything like that it'll cycle off, but if I don't touch it, it plays fine. I had the pot grounded to IG, and it made it worse so that anytime I touched the pot it latched off.
I will play with R18 values to see if I can get the amp stable. If so, then I'll test the bypass setting after.
How much does actual temperature affect the latching? If the tube can't get warm enough will that negatively affect it? I ask because I'm working in my garage and it's maybe 0 to 5 degrees Celcius.
Thanks very much for your help cfcubed!
Edited by civilmonkey - 4/6/11 at 5:09pm