Tested the PS last night. No smoke so that's a step in the right direction! B+ is 264V and the heaters seem to be running quite high at 10.3V. That is with no load.Paul's point about the voltage running high is right. What you are doing when you run the PS without the audio circuitry is just confirming that things are wired correctly and working. The B+ without any load might easily run 30 to 50 volts higher than with the load connected. It's totally safe but don't be surprised if you see something in the 260-275v range with no load. Likewise the voltage on the DC heater supply is going to run higher than you expect, perhaps in the 7.5 to 9.0v range. These are just guesstimates.