Laowei

In Birgir's and Kevin's photos of populated KGST boards there is a socket, for but no OP27 installed. Is the OP27 needed?

Not really, only more heat to dissipate.

Fixed.

Getting ready to send out for some quotes on a custom transformer. I tried to capture all the needs for a KGST in a single unit, using the out of stock Antek transformer and posted info here as a basis. For those that have more experience ordering custom transformers, do any of the following specs look too constraining or impractical? KGST POWER TRANSFORMER SPECIFICATIONS: 120VA toroidal audio power transformer with: -Static shield between primary and secondary coils. -Heavier gauge wires than normal requirement to avoid the copper lost at full power. -Magnetic shield around the outside to reduce the magnetic leakage. -HiPot 3500V between primary and secondary coils. -Approximate overall dimensions: 100mm diameter x 50mm height. -Mechanically silent operation. -45C maximum temperature in ambient 20C environment. -Mounting hardware included. -All wires out minimum 300mm long. ELECTRICAL CHARACTERISTICS: Power: 120VA Inputs: 2X Voltage-Hertz 117V-50/60hz 117V-50/60hz Outputs: 5X Voltage@Current [email protected] [email protected] [email protected] [email protected] 6.3V @1.5A Thanks for any suggestions. I will send for quotes in a few days.

FYI...you can buy the SR-207 separately from Stax USA: https://www.staxusa.com/earspeaker/stax-sr-207.html

Sadly, I am that old too. So I have only built "normal tube amps". The KGST is my first amp for electrostatics. Going to learn a lot.......

Thanks Birgir, for the specs and your tip on no CT for the heaters. Never seen -400VDC in my previous tube amps built for driving speakers and headphones.

Looking for the specs for the power transformer needed for the KGST. Looks like the PS PCB inputs 2x 280-325VAC and 36VAC CT (each at what current load?). Plus will need 6.3VAC [email protected] for the 6S4A heaters on the amp boards. Any other requirements? Thx.

Hi Birgir..... I am too new to Head-Case and I can't pm you or reply to your ad in the Trader Section. I'm interested in building the KGST and saw a few nice pieces in your ad that I would like to purchase. Please pm me if this is possible. Thx

Thanks for all the hard work Kevin and Birgir. I am really looking forward to building this.

I am also a first time poster here and interested in the PCB group buy. Please pm me too if I can be included. Thx