He demonstrated it in use, and even goes as far as to show it running an audio power amplifier driving a small speaker. For the dedicated student of op-amps, may we suggest further reading as we ...

Dyer, “The GAP/R K2-W Vacuum-Tube Op Amp in SPICE,” Electronic Design, Dec. 9, 2024. 5. “Model K2-W Operational ... communication systems, digital signal processing, instrumentation and ...