Good call. We may not have the correct schem yet. Ricky: Got any schems that match the pictures? (Also note the "paper caps" that look like resistors, just to add to any confusion here. ) Deepstone: Which power tube red-plates (V4 with green wire to pin 5, or V5 with orange wire)? Did you try swapping the power tubes (V4 to V5 and vice-versa)? Since you've had the same problem with two sets of tubes, it's probably in the same socket but let us know. It may help if you post some voltage readings from both power tube sockets if you're comfortable doing so. Remove the power tubes first, power on and exit standby. Post voltages for pins 3, 4, 5 and 6. All are DC and can be measured at your meter's highest DCV setting (the yellow "500"). Be careful and ask if you're not sure about anything.