Although I'm not working on a DHT, I'm just getting ready to start some twin triodes
Before the winter gets away, I want to get my tubed phonostage [finally] built. Willie, this is something you can appreciate, I salvaged a pair of transformers out of a pair of old Roberts (Akia) M-8 reel to reel amps and I'm going to use them to drive the phonostage. These have more than ample current delivery though the B+ voltage is just a tad low at 250v. That's OK, after looking at the 12AX7 chart, it's still pretty linear at that lower voltage.
This will be a true dual mono design with a pair of 6x4s as a rectifier. I've been bouncing ideas (and modeling) on PS filtration off Mike Galusha. We had [basically] the same thoughts though he added a couple extra RC stages after the Pi. It only ate up about 6 volts but it got the ripple down to less than 1mV. As you know, that's a big deal in a phonostage.
I need to order the PS parts and some copper plate then get this thing done. I'm going to do a two chassis design with an umbilical to the phonostage (proper). I'm doing a polished copper plate top and some sort of exotic wood sides. I haven't decided if I want the PS caps exposed or concealed. I'll probably go concealed. I'll probably go with flat black on the transformers.
Oh, I've got a spare pair of phonostage boards for my big Korato that is what I'll be using. Actually, I'll pull the ones in use now as they have the V-Cap Teflon coupling caps and use them in the new PS. I've got some other decent caps I'll use in the replacement PS for the big Korato.
After that one, it's on to building new enclosures for my Tannoy 12s
They're taking the place of the KoRnZilLas in the exercise room.
