Service Data [12/2012 - ]
LIGHT CONTROL RHEOSTAT
| Resistance | 9 (T) - 6 (E) | Always | 10 +/- 2 kΩ |
| 7 (TR) - 6 (E) | Knob turned fully upward | 10 +/- 2 kΩ | |
| Knob turned fully downward | Below 50 Ω | ||
| Knob turned from fully upward to fully downward | 10 +/- 2 kΩ → Below 50 Ω | ||
| 9 (T) - 8 (TC) | Knob turned fully upward (TAIL cancel condition) | 10 kΩ or higher | |
| Knob not turned fully upward | Below 1 Ω |