All American Five Variations on the theme Variations on the theme

| _Tubes | Converter | Det_Pre_amp | Audio_Amp | Rectifier |
|---|---|---|---|---|
| 4 | X | X | X | X |
| 4 | X | X | X | (selenium) |
| 5 (standard) | X | X | X | X |
| 6 | X | X | X | X |
| 6 | X | X | X X (push-pull) | X |
| 8 | X | X X (push-pull) | X X (push-pull) | X |
| 8 | X | X | X X (push-pull) | X |