| Specification | Code | Description |
|---|---|---|
| Reverb Type | 1 | Short (9¼") 2 spring unit |
| 4 | Long (16¾") 2 spring unit | |
| 8 | Short (9¼") 3 spring unit | |
| 9 | Long (16¾") 3 spring unit | |
| Input Impedance | A | 8 Ohms |
| B | 150 Ohms | |
| C | 200 Ohms | |
| D | 250 Ohms | |
| E | 600 Ohms | |
| F | 1,475 Ohms | |
| Output Impedance | A | 500 Ohms |
| B | 2,250 Ohms | |
| C | 10,000 Ohms | |
| Decay Time | 1 | Short (1.2 to 2.0 sec.) |
| 2 | Medium (1.75 to 3.0 sec.) | |
| 3 | Long (2.75 to 4.0 sec.) | |
| Connectors | A | Input and Output Grounded |
| B | Input Grounded, Output Insulated | |
| C | Input Insulated, Output Grounded | |
| D | Input and Output Insulated | |
| E | No Outer Channel | |
| Locking Devices | 1 | No Lock |
| Mounting Plane | A | Horizontal, Open Side Up |
| B | Horizontal, Open Side Down | |
| C | Vertical, Connectors Up | |
| D | Vertical, Connectors Down | |
| E | On End, Input Up | |
| F | On End, Output Up | |