Okay, looks like we have a baseline.
When the sumr transformer did not look like it would make it in time, I placed an order for the Antek transformers colbaltMute so graciously found as a backup. That turned out to be a good idea, otherwise, we would be waiting. The AN-0107 is being used for the heater and the AN-0232 is being used for the +/- 30V rails. It is early, but they appear to work just fine. Both power supplies appear to be holding in regulation just fine. I have had very little heater supply drift once the tubes warm up properly. The +/-30V rails appears just as stable, but, it is early. biasing of the MOSFET's went fine. As expected, they drift with temperature, but, hold fine once everything is up at temp.
I ended up using the "Two Channel Alternate Wiring" hook up from the site. With the first wiring, I had a slight buzz. That cleared up with the alternate wiring. Realize, the test platform is not ideal for noise containment, but, it appears to be fine. No buzz or hum, just a slight hiss at full-open with a little bit of background noise. I suspect, a real case and careful re-orientation of the wiring (like, moving star ground from the same terminal strip as the power) should clean that up just fine. Nothing that should not clear up with a better installation.
At this point, I think it is safe to proceed with the rest of the beta builds. I found nothing in the build that was a real issue beyond the LED orientation for the -30V rail. That was the only component I had to pull and replace. Everything else came up first shot. No issues.
I need to take a break for food. I am starving.
After dinner, I will measure the DC offset at power on, see how fast it settles and also take some temperature measurements on each of the heatsinks.
Oh yeah, sounds great!