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Accutronics Products and Specifications

There are a number of different reverb types available. Use this guide to help you determine part number based upon your specifications and application.
Tech Corner Image - Accutronics Type4

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.

Tech Corner Image - Accutronics Type8

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.

Tech Corner Image - Accutronics Type9

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 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