I'm repairing / refurbishing a 1970s Acoustic 134 guitar amp. It's missing the spring reverb tank (someone obviously removed it some time in the past) and I'd like to install a new one but I'm at a loss as to what the proper specs are or how to find them.
The service manual/schematic does not provide any specs; the only information listed there is Acoustic part # 315006 (which has proved useless so far). I have contacted several online companies that deal with vintage equipment and/or reverb tanks (Studio Sound Electronics, Accutronics, Model Electronics, Tubesandmore, Ruby Reverb, etc.) and no one has been able to find specs or suggest a proper replacement.
There are 4 mounting holes in the head chassis for the tank - long dimension between holes is 222mm (8-3/4"), short dimension between holes is 99 mm (3-7/8"). I'm told this makes it an "8 series tank", but that just indicates the physical size. Need to know input and output impedance and grounding arrangements.
Anyone have a suggestion? I guess ideally I would need someone with a 134 to take a look at the reverb tank and see if there's any numbers on it. Or, tell me (1) what is the DC resistance reading across the input and output jacks? and (2) is the outside ring of the RCA jack tied to the reverb case on both input and output jacks? With that info I could probably identify a compatible replacement. Thanks for any help.
The service manual/schematic does not provide any specs; the only information listed there is Acoustic part # 315006 (which has proved useless so far). I have contacted several online companies that deal with vintage equipment and/or reverb tanks (Studio Sound Electronics, Accutronics, Model Electronics, Tubesandmore, Ruby Reverb, etc.) and no one has been able to find specs or suggest a proper replacement.
There are 4 mounting holes in the head chassis for the tank - long dimension between holes is 222mm (8-3/4"), short dimension between holes is 99 mm (3-7/8"). I'm told this makes it an "8 series tank", but that just indicates the physical size. Need to know input and output impedance and grounding arrangements.
Anyone have a suggestion? I guess ideally I would need someone with a 134 to take a look at the reverb tank and see if there's any numbers on it. Or, tell me (1) what is the DC resistance reading across the input and output jacks? and (2) is the outside ring of the RCA jack tied to the reverb case on both input and output jacks? With that info I could probably identify a compatible replacement. Thanks for any help.