Accutronics makes several types of tanks, but the three types most commonly found in mass produced amps are the 4, 8, and 9.

The type 4 is 17" long and is commonly called a "2 Spring" even though it actually uses 4 springs joined together to form 2. This is the type most often found in Fender Amps.

The type 8 is 9" long and is commonly called a "3 Spring". This model actually uses 6 springs joined together to form 3. This is the type most often found in Marshall Amps.

The type 9 is 17" long and is commonly called a "3 Spring". Again, this model actually uses 6 springs joined together to form 3. These are most commonly found in Mesa Boogie Amps or used as an aftermarket upgrade for Fender Amps to increase the reverb characteristics over the stock 2 spring model.

**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 |

Sound
Enhancements, Inc.

185 Detroit St.

Cary, IL 60013