All American Five
Variations on the theme
Columns: # 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