Thanks for the compliments. So far, it sounds really good. I hooked it up to a pair of Klipsch Chorus II and the two seem to play very nicely together. The bass is rich, warm, and deep. The highs are clean, airy, and magical. With no input signal, I get only the faintest of 120 Hz hum from the woofer if I put my head right into it. The tweeter and squawker are dead silent - not a trace of hiss or noise anywhere. It is a remarkably clean and quiet amplifier. I didn't even have to pull any tricks with the grounding. The ground wire from the IEC goes straight to the extra ground lug on the board's terminal strip.
I took a few preliminary measurements from the amp before I installed the tubes. The Edcor power transformer makes 695 VAC with no load. The DC voltages at the filament pins of the power tube sockets were exactly at 8.00 volts. I'd like to take a few more measurements to verify operating values, but I was too busy listening to it. Can I operate the 6B4G tubes on their sides? Usually I'd flip the amp on its edge to check the voltages while it's running, but I don't know if that would be a good idea considering the way their filaments are constructed.
I'll have to admit I experienced a little bit of disappointment with the amplifier's visual appeal. There's nearly no visible glow coming from the filaments of the 6B4G. You have to peek down through the slot in the top of the mica to see the inside, where you can make out the dull orange glow of the W shaped cathode. I suppose the minimalist approach to my chassis building doesn't help any in the looks department either. One of these days, I swear I'm going to get off my duff and finish the chassis plates of my amplifiers. I've got some nice hardwood I should use to build the box. Oh well.
Tom's advice about Front Panel Express is good. I'd give them a try if I weren't such a cheapskate. I usually manage to find scrap pieces of aluminum plate for nothing, and I don't mind drilling a few holes in them. Another big plus for FPE is that you can get your plates with a anodize finish on them.
Here's another photo with a little better lighting, and another of my attempt to catch the 6B4G: