The 55C was designed for use with Conn organs. Unlike the other Conn cabinets this one can not be so easily used with other organs.
This is due to the fact that in these cabinets, tremolo switching was accomplished by switching audio channels.
| Amplifier Type | 2 Channel Vacuum Tube |
| Output Power | unknown |
| Drum | Rotosonic |
| Horn | None |
| Speeds | None |
| Interface | 6 Pin 2 Channel |