Hokay. Major update. After a boatload of hours inhaling sweet sweet solder/lead fumes, I came up with something. Not too unexpectedly, it makes almost ZILCH sound. But, it looks kind of cool while doing it :)
I'll post full schematics as soon as I write them out nicely. In the meantime, it's a White CF per channel driven by a single triode grounded-cathode. All tubes are 7AU7's. Why 7AU7's? they're cheap. Why two filament transformers? I had them lying around when I thought I needed them for monoblocks. The big cap in the middle is also used, if you recall my first somewhat awkward 6SN7 preamp, that was one of the three. Also, please don't laugh TOO hard at my very "special" looking homemade cap clamps for the output couplers...
Details of the White CF:
Top anode resistor = 14K 2W. bottom cathode resistor is 680 ohms bypassed with a 220uF 16V Blackgate and a 2.2uF 63V WIMA. There is a .1uF 630V Solen between the top anode and the bottom grid, and a 1M resistor between the bottom grid and ground.
The output stages branch off from the top-cathode bottom-anode connection. One of them is a simple 4.7uF/47K to the RCA jacks. The other goes to the chassis-mounted caps. 220uF 105C 450V bypassed with 2.2uF 630V Solens, to the 1/4" stereo jack. I have two adjustable feedback pots connected by a 1K resistor to the outputs. They're allegedly 50K linear but I never managed to measure anything higher than 25K from them.
In short - what in God's name do I do now to get this thing working? I'm thinking of subbing in some 6N23P's (they sim better in TubeCAD.) I'll also mess with the cathode resistor and bypass caps, because TubeCAD told me to use a value of less than 32uF...? This thing will be a bit of work especially since it's the highest-density soldering I've ever done.
(and yes, that is Deep Dish's classic "Penetrate Deeper" album. Cheesy deep house at it's best Yellow_Light_Colorz_PDT_06
If anyone wants detail pictures, let me know..