There are a number of different reverb types available. Use this guide to help you determine part number based upon your specifications and application.
Type 4
The industry standard for years, the type 4 is still manufactured today using Hammond's original design. Four counter wound and coupled springs deliver superior mechanical performance and the classic sound that helped make the Fender Twin Reverb amp famous. Outer channel dimensions are 16.75" length x 4.735" width x 1.313" height.
Type 8
Designed for applications in which the overall sound quality is important and a compact package is required. Small in size, this three spring reverb approaches the rich textural quiality of the larger reverb units. Outer channel dimensions are 9.25" length x 3.375" width x 1.313 height.
Type 9
Six springs, counter wound, coupled and placed in parallel, combine to create Sound Enchancement's fullest, richest reverb effect throughout the full range of musical sound. Ideally suited for keyboard, sound reinforcement and pedal steel applications. Outer channel dimensions are 16.75" length x 4.375" width x 1.313 height.
Part Numbering System
Reverb part numbers consist of seven digit code, ie
4EB2C1B Each digit in the part number represents a specification. The part numbers are as follows:
| Digit | Specification |
|---|
| 1st | Reverb Type |
| 2nd | Input Impedance |
| 3rd | Output Impedance |
| 4th | Decay |
| 5th | Connectors |
| 6th | Locking Devices |
| 7th | Mounting Plane |
Part Numbering Specifications for Type 1 and Type 4
Example:
4EB2C1B
| Digit | Meaning |
|---|
| Digit #1 - Reverb Type |
| 1 | Type 1 |
| 4 | Type 4 |
| Digit #2 - Input Impedance |
| A | 8 Ohm |
| B | 150 Ohm |
| C | 200 Ohm |
| D | 250 Ohm |
| E | 600 Ohm |
| F | 1,475 Ohm |
| Digit #3 - Output Impedance |
| A | 500 Ohm |
| B | 2,250 Ohm |
| C | 10,000 Ohm |
| Digit #4 - Decay Time |
| 1 | Short (1.2 to 2.0s) |
| 2 | Medium (1.75 to 3.0s) |
| 3 | Long (2.75 to 4.0s) |
| Digit #5 - Connectors |
| A | Input Grounded/Output Grounded |
| B | Input Grounded/Output Insulated |
| C | Input Insulated/Output Grounded |
| D | Input Insulated/Output Insulated |
| E | No Outer Channel |
| Digit #6 - Locking Devices |
| 1 | No Lock |
| Digit #7 - 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 |
Part Numbering for Specifications for Type 8 and Type 9
Example:
8EB2C1B
| Digit | Meaning |
|---|
| Digit #1 - Reverb Type |
| 8 | Type 8 |
| 9 | Type 9 |
| Digit #2 - Input Impedance |
| A | 10 Ohm |
| B | 190 Ohm |
| C | 240 Ohm |
| D | 310 Ohm |
| E | 800 Ohm |
| F | 1,925 Ohm |
| Digit #3 - Output Impedance |
| A | 600 Ohm |
| B | 2,575 Ohm |
| C | 12,000 Ohm |
| Digit #4 - Decay Time |
| 1 | Short (1.2 to 2.0s) |
| 2 | Medium (1.75 to 3.0s) |
| 3 | Long (2.75 to 4.0s) |
| Digit #5 - Connectors |
| A | Input Grounded/Output Grounded |
| B | Input Grounded/Output Insulated |
| C | Input Insulated/Output Grounded |
| D | Input Insulated/Output Insulated |
| E | No Outer Channel |
| Digit #6 - Locking Devices |
| 1 | No Lock |
| Digit #7 - 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 |
