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Accutronics reverb tank numbering system
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/Ampeg/Crate™ |
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, PRS |
9" |
3 |
10ohms/.81ohms |
2575ohms/200ohms |
|
8BB2A1B |
Ampeg™ / Crate |
9" |
3 |
190ohms/26ohms |
2575ohms/200ohms |
|
8DB2C1B |
Marshall™ |
9" |
3
|
310ohms/36ohms |
2575ohms/200ohms |
|
8EB2C1B |
Fender |
9" |
3
|
800ohms/58ohms |
2575ohms/200ohms |
|
