Although [Marcel] hasn’t posted up detailed build instructions yet, his simple schematic should be all you need to get started. If you want some more background information about tube amps but ...

Shown in the schematic is the setup used to evaluate ... Dyer, “The GAP/R K2-W Vacuum-Tube Op Amp in SPICE,” Electronic Design, Dec. 9, 2024. 5. “Model K2-W Operational Amplifier ...