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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.

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:

DigitSpecification
1stReverb Type
2ndInput Impedance
3rdOutput Impedance
4thDecay
5thConnectors
6thLocking Devices
7thMounting Plane

Part Numbering Specifications for Type 1 and Type 4

Example: 4EB2C1B

DigitMeaning
Digit #1 - Reverb Type
1Type 1
4Type 4
Digit #2 - Input Impedance
A8 Ohm
B150 Ohm
C200 Ohm
D250 Ohm
E600 Ohm
F1,475 Ohm
Digit #3 - Output Impedance
A500 Ohm
B2,250 Ohm
C10,000 Ohm
Digit #4 - Decay Time
1Short (1.2 to 2.0s)
2Medium (1.75 to 3.0s)
3Long (2.75 to 4.0s)
Digit #5 - Connectors
AInput Grounded/Output Grounded
BInput Grounded/Output Insulated
CInput Insulated/Output Grounded
DInput Insulated/Output Insulated
ENo Outer Channel
Digit #6 - Locking Devices
1No Lock
Digit #7 - Mounting Plane
AHorizontal Open Side Up
BHorizontal Open Side Down
CVertical Connectors Up
DVertical Connectors Down
EOn End Input Up
FOn End Output Up

Part Numbering for Specifications for Type 8 and Type 9

Example: 8EB2C1B

DigitMeaning
Digit #1 - Reverb Type
8Type 8
9Type 9
Digit #2 - Input Impedance
A10 Ohm
B190 Ohm
C240 Ohm
D310 Ohm
E800 Ohm
F1,925 Ohm
Digit #3 - Output Impedance
A600 Ohm
B2,575 Ohm
C12,000 Ohm
Digit #4 - Decay Time
1Short (1.2 to 2.0s)
2Medium (1.75 to 3.0s)
3Long (2.75 to 4.0s)
Digit #5 - Connectors
AInput Grounded/Output Grounded
BInput Grounded/Output Insulated
CInput Insulated/Output Grounded
DInput Insulated/Output Insulated
ENo Outer Channel
Digit #6 - Locking Devices
1No Lock
Digit #7 - Mounting Plane
AHorizontal Open Side Up
BHorizontal Open Side Down
CVertical Connectors Up
DVertical Connectors Down
EOn End Input Up
FOn End Output Up