4-65a SE Amp: filament regulators Finished the 4-65a filament regulators. Filament noise is only 1.5 mVrms at full load (3.5A):
814/VT-154 triode mode curves First set of characteristic curves in triode mode: A first attempt to produce a SPICE model was quite successful: The valve glowing in the dark, nice….
4-65a glowing in the dark These were taken at my lab in the attic during the summer evening twilight. 51.443297-0.132847