Here are a few pics of my test build. GR78/GR79 are set for +/-15VDC, GRHV set for +237VDC/-247VDC. I did not build out the bias supply on this board. I use 182K for R22 and 330uF for C17 which results in timer delay of about 75 seconds. I also tested a 500K/100uF setup which results in about 55 seconds delay. The 100K/470uF combination in the BOM provides about 50 seconds delay. Not these numbers will vary a bit mostly due to the tolerance of the capacitor (see more details in the next post).
The PSU main board is of a modular design (see the schematic). It contains the following circuits:
1. A set of GR78/GR79 low voltage regulators.
2. A set of GRHVxx high voltage regulators (B+ and B-).
3. A CD4093BM trigger based timer control (need to provide aux-power, see my posts below).
4. CPC1117N based soft-start for the GRHV.
5. A configurable headphone bias supply (2 outputs are provided - Bias H and Bias L).
Note that C1, C2, C3, C4 are pre and post regulation filter capacitors and their values and voltage rating need to be picked based on your needs. The pitch for the pins are all 10mm. C1, C2 diameter need to be 35mm or less and C3, C4 need to be 22mm or less. Pick caps with smaller diameters if you don't like the caps physically touching each other when installed.
I mounted the pass transistors of the GRLV in a goofy way and it's not what Kerry has intended. For a normal person, the pass transistors should be behind the PCB