Anyone has experience with the Ebay kits for the KGSSHV Carbon:
https://www.ebay.com/itm/Power-supply-PCB-for-KG-Kevin-Gilmore-KGSSHV-CARBON-Electrostatic-amp-L9-50/123415369465
and
https://www.ebay.com/itm/Kevin-Gilmore-KGSSHV-CARBON-Electrostatic-Headphone-amplifier-bare-PCB-L8-39/123327894674
The names contain "L9-50" and "L8-39": are these version numbers ?
I'm interested in building a KGSSHV Carbon and any help is appreciated.