3 amps in the archive
The matching circuits, with the neighbouring topology choices shown for contrast.
| Circuit | Era | Output | Tubes | Phase inverter | Output-stage bias | Rectifier |
|---|---|---|---|---|---|---|
| 6G6-B | 1963–1964 | 50 W | 7025, 7025, 7025, 7025, 5881, 5881 | long-tailed-pair | fixed | solid-state |
| B15N | 1961–1964 | 25 W | 6SL7, 6SL7, 6SL7, 6L6GC, 6L6GC, 5AR4 | paraphase | fixed | 5AR4 |
| S1484 | 1963–1967 | 60 W | 12AX7, 12AX7, 6CG7, 12AX7, 6CG7, 12AX7, 6L6GC, 6L6GC | cathodyne | fixed | 1N3194 ×4 (capacitor multiplier) + 1N3754 (bias) |