THERMION

Eight structurally different valve circuits, four measured valves plus one that cannot exist, and a BIAS knob calibrated in real milliamps of plate current — because every published Culture Vulture setting is a meter reading, and a dial number isn't comparable to any of them. The valve is solved from Dempwolf & Zolzer's cathode-current law on a real load line, not shaped after the fact, so grid blocking, screen sag and supply sag fall out as consequences instead of being bolted on top. db-cell goes to two places at once — blended into the audio as texture, and into the valve's own cathode, so the operating point breathes the way a real supply does.