Pubert Peepis

It's been a while but I just wanted to say thanks. I am considering Spritzer's KGSSHV kit but a ton of the kit-excluded silicon parts are discontinued. Other things came up and slowed me down, now I am considering newer options like the carbon and maybe CFA-E, although the carbon has similar issues with part sourcing now it seems. Either way, this community seems to be the right place to look given the amount of documentation and focus on objective performance.

Digikey recommended C3M0900170D as a replacement. Specs are mostly quite similar but Vgs(th) is slightly different, and the gate-source voltage curves look different from C2M1000170D. I believe this graph tells us about the gain and linearity? I am not at all well versed in transistors so don't take my word at face value. I looked at Wolfspeed's C3M lineup for 1.2-1.7kV, and basically everything had huge input and output capacitance or gate-source curves that didn't look as linear as the C2M1000170D. But again, I don't completely understand what I'm looking at, and will happily be corrected to learn. Edit: The domain and range of the graph is different. The 175C curve definitely seems droopier than C2M’s, so it’s hard to know what it’s like at 40-60C or whatever we operate it at. C3M0900170D https://assets.wolfspeed.com/uploads/2025/02/Wolfspeed_C3M0900170D_data_sheet.pdf Wolfspeed C3M, 1200 & 1700V, TO-247 https://www.wolfspeed.com/products/power/sic-mosfets/?blockingVoltage=1200 V|1700 V&package=TO-247-3

Hi, First post here. I am curious about building an electrostat HPA as I only have an SRD7 Mk2. I am interested in some of Kevin Gilmore's designs like the KGSSHV variants and the T2, but the legend about the KGSSHV seems to ring true that it is hard to build and hard to learn about. Is there somewhere I can read about these different designs in white paper format like Nelson Pass does with the First Watt amps? I can't even find schematics or a BOM. It's truly a nightmare, and I don't want to endlessly bother spritzer with questions. Frankly, I am not totally sure of the "authorship" of each of these amps which makes it harder to research. I was considering first building a Nectar Agave since it could probably be finished between semesters, and it has a clear BOM, PCB files and a cost estimate- where as the KGSSHV line is known to be good quality but near impossible to read about. I don't expect to understand everything, just hoping to understand more what makes each design unique and uniquely capable at driving an electrostat to decide what to build. Thanks in advance for any pointers of where to read about them.