Tinkerer

Got mine today. Everything looks good. Can't wait to try it out.

Shipping paid.

Awesome. Those quads look nice. Can't wait to get this stuff in.

Any word on when the TDK pots might come in? Seeing all the lovely boards is making me itch to get started on project stuff.

Boy, those HV900 wound up being pricey but if they're done right, it will be worth it. Kinda surprised nobody else jumped in for even one set since the original run was around a dozen folks IIRC.

You know, the Selectric that ball comes off of has compatible keycaps with the IBM beamspring terminals, the most valued terminal keyboards in modern history. Very nice.

The HV900 revised boards still aren't up on the sheet yet. I know I might be the only guy that wants them, but I will pay the price for a set even if it's kinda high. I need it to finish my build, and it would sure be nice to get them with the couple other things I want in this GB.

So the fat are the ones that can be used with bracket mounts. I must be confusing it with the old KGSSHV where fat was both halves together. Cool. I do think those are better as well. But I got all I need in that department so that's for you guys to hammer out.

Current GRHV split is the V6 or V7 I think. It has silk options for 400V and 450V. The people wanting the fat supply want the +/- combined in one board which is a little different. Circlotron HV900 is definitely it's own PSU. Each board is like 2 KGSSHV +'s duct taped together for 900VDC and you need four of them. I had a question on the TKD 4CP601 pots though. For a stat amp, is the 10K or 50K preferable? Because 'll grab one of those.

I'm interested in HV900 single V2's for the Circlotron. Not sure how many other people are looking at building but they're 4x of the same board for a set so hitting minimums should be a little easier.

Went ahead and did one last thing as a check. Moved one of the HV900's directly under an output board with another flipped directly next to it for minimum lead length and had all leads HV900 shortened to <5 inches. Got the exact same sound. No louder. No less. The new HV900 boards look good to me. Parts match what they should. I didn't go through every trace though. If they look clear, anybody else interested in having them made? I'll chip in for two sets to start it along. Somebody else would probably need to run the buy though, since my experience with PCB houses at this spec is nill.

I remember I tried that at the primary end once at it didn't change noise behavior in either channel, but not sure how I'd do it at the secondary. With 4 secondary pairs in a channel set and no oscilloscope, I'd probably need to go through all 16 combinations and hope one cancels like how a balanced cable works. Is there a smarter way to go about it?

Dumb question but what's that fifth thing on the bottom side that's not the STN0214 or STN9360?

The normally open power mosfet mounted on the +900 out with a resistor picked for gate voltage to hit at a little under 50mA current to the output board. Just a second safety pretty much. IXTH6N100D2 I think. On the mounting front for the singles, longer is perfectly fine for me, it's just wider I can't do. My side sinks are three separate 6" wide aluminum blocks stacked side to side and the current HV900 singles take up pretty much all of one 6" block per mount horizontally.

If I had a wishlist on a HV900 V2, it would probably be: Each still split into a separate board for four total (mostly so I don't have to make a new set of brackets or drill new holes in the heatsink and easier to service if one blows) Transformer inputs on the front like you posted instead of the side like in the first run boards (shorter transformer secondary leads and easier to get to) Integrated current limiter (would help shorten leads for whole output stage) Ground plane (I know it's not a ground part of the circuit but wouldn't it still need a terminal to ground?) Change the 4.42K Xicon to 4.32K Dale resistor so it's closer to 900VDC even instead of a little higher. But you know better than me. I can just put stuff together and troubleshoot a little bit, read specs on parts or whatever. Design itself is not something I really understand.