Notice to our customers:   Studio Sound Electronics will be closed from Wednesday May 23 through Sunday June 10.  No orders or inquiries will be taken or processed during this time.   If a mailed-in order is received during this time, it will be processed starting on June 11.    Orders received by 11:00pm EDT on May 22, 2012 will be shipped out before we close.     We will reopen for business on Monday June 11.   We appreciate your understanding, and as always, thank you for your business.

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
 

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: