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

**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 |

Type | A | B | C |
---|---|---|---|

4 | 500 ohms | 2250 ohms | 10000 ohms |

8 and 9 | 600 ohms | 2575 ohms | 12000 ohms |

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 |