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Accutronics Reverb
Tanks

Almost all the reverb tanks that one sees for sale
are the Accutronics brand. They are made by:

Sound Enhancements, Inc.
185
Detroit St.
Cary, IL 60013
Although they make many models, the three
types that are readily available are a limited number of their types 4, 8, and
9. The type 4 is 17" long and uses 2 long springs, each of which consists of two
springs joined in the middle. Thus, Accutronics considers this model a 4-spring
unit. This type was the original style selected by Leo Fender. The type 8 is 9"
long and uses 3 springs. This type is most famous for its use by Marshall. The
type 9 is 17" long and uses 3 long springs, each of which consists of two
springs joined in the middle. Analogously, Accutronics considers this unit a
6-spring device. All Accutronics' part numbers consist of 7 characters as
described below.

1st character: type 4, 8, or 9

2nd character: Input impedance @ 1kHz

Type

A

B

C

D

E

F

4

8 ohms

150 ohms

200 ohms

250 ohms

600 ohms

1475 ohms

8 and 9

10 ohms

190 ohms

240 ohms

310 ohms

800 ohms

1925 ohms

3rd
character: Output impedance @ 1 kHz

Type

A

B

C

4

500 ohms

2250 ohms

10000 ohms

8 and 9

600 ohms

2575 ohms

12000 ohms

4th
character: Decay time
1 = short (1.2 to 2 sec)
2 = medium (1.75
to 3.0 sec)
3 = long (2.75 to 4 sec)

5th character: Connector arrangement
A = input grounded,
output grounded
B = input grounded, output insulated
C = input insulated,
output grounded
D = input insulated, output insulated

6th character: Locking device 1 = no lock

7th character: Mounting plane
A = horizontal,open side
up
B = horizontal, open side down
C = vertical wall,long axis horizontal,
connectors up
D = vertical wall, long axis horizontal, connectors down
E =
vertical wall, long axis vertical, input up
F = vertical wall, long axis
vertical, output up

The following table summarizes the above data for the most commonly available
units:

PART NUMBER

PRIMARY USER

LENGTH

NUMBER OF SPRINGS

INPUT IMPEDANCE@ 1KhZ/DC

OUTPUT IMPEDANCE @
1KhZ/dc

4AB3C1B

Fender

17"

4

8ohms/.81ohms

2,250ohms/200ohms

4BB2C1B

Acoustic/SLM/Ampeg

17"

4

150ohms/26ohms

2,250ohms/200ohms

4EB2C1B

Peavey

17"

4

600ohms/58ohms

2,250ohms/200ohms

4FB3D1B

Music Man
General

17"

4

1475ohms/200ohms

2,250ohms/200ohms

9AB2C1B

Fender/
Boogie

17"

6

10ohms/.81ohms

2575ohms/200ohms

9EB2C1B

Peavey/General

17"

6

800/58ohms

2575ohms/200ohms

9FB2A1C

General

17"

6

1,925/200ohms

2575ohms/200ohms

8AB2A1B

Boogie

9"

3

10ohms/.81ohms

2575ohms/200ohms

8BB2A1B

SLM

9"

3

190ohms/26ohms

2575ohms/200ohms

8DB2C1B

Marshall

9"

3

310ohms/36ohms

2575ohms/200ohms

8EB2C1B

Fender

9"

3

800ohms/58ohms

2575ohms/200ohms