not too bad. I can hold indefinitely one of the fins that is right over one of the output devices. I'll track down my thermocouple. I'm probably going to leave it this way, because A.) Steve is planning for this to primarily power the K1000 (I have no idea what the impedance of these things drops down to, but it cannot be too low) and B.) those trim pots are impossible to get to, so I have the heat sink tipped up on it's side, which hinders convection and I'll probably need to readjust later anyways.
The variac came in very handy. I was able to adjust the output of the unregulated CRC supply to the nominal +-24V, which wouldn't have been possible otherwise since I'm only running a single channel at the moment.