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I'm trying to restore my amp and the reverb unit is missing a spring and the connecting parts that the hook to. The problem I'm having is identifying what the part number for the unit is so I can replace/repair it. I know it's a type 4. I seen one on the web that was in a Hagstrom amp that looked just like mine and it's part number was 4FB2A1C but that was a transistor amp and they require higher resistance than a tube amp. My unit doesn't have any part number with that format on it. It does have 2 numbers on it, 23-5002-2 and the other is 65443. Does anybody know what the proper part number for the V3 tube model is and if so where I can get parts or replacement for it?
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This thread might help you out (I hope):
Vintage Amps Bulletin Board • View topic - vintage VOX Camb. Rvb. REVERB TANK -
I would think that the basic Fender combo tank should work in your amp. The Cambridge Reverb schematic that I have is not for the V3, but it shows the typical tube driven tank. I have the later version of your amp and I know that the Fender tank will work in it.
So my guess would be 4AB3C1B. Getting repair/replacement parts used to be possible, but now you will have to replace the entire tank.
By the way, 23-5002-2 is the Thomas Organ part number and the 65443 (this usually is a 4 digit number) is the Accutronics date code.Comment
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Some pretty good info, got questions
52 Bill, cool stuff about the Thomas Organ info and it was a 4 digit number (6543) most have double hit the 4 key. I was looking at this link
Accutronics Reverb Tanks
and it shows the 4AB3C1B as having an DC input resistance of .81 ohms and an output resistance of 200 ohms. Mark Black sent a link that shows a 4EB3C1B and it's input is 58 ohms and output is 200 ohms. I'm assuming that that is the value measured across the transducers with an ohm meter. I checked mine and it came out as 165 ohms and 175 ohms. It does still have one spring connected and I'm wondering if that is affecting my readings. If not then mine would have a high impedance on the input and the output. Any ideas?Comment
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The springs being on or off should have no effect on your DC resistance measurements.
Found another mention of the 23-5002-2 tank in this thread:
Vintage Amps Bulletin Board • View topic - Reverb on 65 Cambridge
...which reminded me - if the tank was originally made by Accutronics then you might be able to get an idea what the input & output impedances are supposed to be by the color of the plastic bobbins for the transducers. There is a chart in the "Application" section on the Accutronics site which lists input & output impedances and their associated bobbin color.
Accutronics website: ::::::::: Accu Bell Sound Inc :::::::::
Your measurements lead me to believe a replacement tank part number should start with "4FB", with the rest of the numbers/letters filled in to match your other tank characteristics.
Kind of a high input impedance compared to most transformer-driven tanks, but maybe that's part of the particular sound of that amp...Comment
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I will agree with Mark Black, in that the resistance readings of your transducer coils leads to the 4FB tank. So if your tank is original to the amp and your resistance readings are correct then the 4FB would be the correct replacement.
That being said, I would still recommend the 4AB tank as I know that it works in this application.Comment
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I had to find a reverb unit for a 1964 Selmer Thunderbird. I initially tried a 4AB but not compatible, 4FB worked. There is a site that gives the approximate DC impedance readings for these tanks on the web. I have used a medium delay version which has a subtle effect compared to sound clips I have listened to on youtube and the sound of my Fenders. The long delay version was probably what was originally used.Comment
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Guyfergy, I also have a 1965 Cambridge Reverb, tube style.It has a "2 spring" long style reverb tank.Here is what's written on it: 1122 is stamped into the metal cover/ pan.That's all that is written on the topside of the cover/pan....The number 23-5002-2 is stamped onto one of the bottom/side mounting flanges.....Under the springs is a label that says: Gibbs Manufacturing and Research Corp. Janesville, Wisconsin, a subsidiary Hammond Organ Corporation. ..............The transformers are red.......I assume it is the original tank , no guarantees. Hope this is useful to you, Regards, StevenComment
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