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I'd appreciate thoughts on this problem. My 3 year old seldomn used DRRI had the reverb go out. I had not been using it, but unplugged the footswitch a few times to use on another amp. Turned the DRRI on one day and no reverb. The footswitch checks out fine. I've even jumpered the input jack, tremolo works not reverb. I replaced the 12at7 (#3)--no reverb. I tested the send rca jack and had good signal. I tested the red rca chord from the tank and had no signal. I cranked my test amp but still heard nothing from the tank return. So I'm guessing I have a tank problem. I don't have a clue as to how to troubleshoot and repair the tank. Thoughts anyone? Thanks.
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Do you have an ohm meter available? If you do, read the resistance across the input and output jacks of the tank. The input side should read about 1 ohm and the output side should read about 200 ohms.Originally posted by twiggybush View Post
I didn't understand what you were saying about the signal, if you touch the tip of the RCA cable that is connected to the return jack on the amp and you turn up the reverb control do you hear a buzz from the amp? If you do, plug each end if the tank into the return to the amp. If you shake the tank it should make noise through the amp.
If you open up the tank, each end has two small wires that connect the transducer coil to the RCA jacks. These wire are always breaking off, especially where they connect to the small Molex connector. -
Hi Bill, Plugging in the return jack and touching the tip revealed the return circuit is fine. Using the ohm meter I found the return from the tank was dead. After removing the molex connector I could get my probes on the pins and it was showing open circuit. So,,, I see the fine wires from the coil disappear into the plastic with the connector pins. Using a magnifying glass I could not detect a break. I'm feisty enough to try soldering to those wires but I'm guessing it to be hit or miss. Any tips on attempting that? Worst case I botch it and end up buying a new tank. I'm wondering if theirs a tank thats not so prone to this problem? ThanksComment
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That's a great price for a tank. I only recently started seeing the new Korean made Accutronics tanks, they don't seem to be built any better than the originals.Originally posted by acorkos View Post
Back in the old days tanks were selling for $40, it made sense to repair them. Fender sold replacement parts for them. They offered directions of how to replace the coils.
If you want to try and fix it, try and cut open the tape that covers the coil to expose more of the wire that feeds out to the pins. I usually find that the break happens where the wire bends over the sharp edge of the coil form. Worst case is you break the wire further in and then you can remove the coil and unwind the wire and then rewind it back on. That will fix it, but it will cost you you less to just buy a new one.Comment
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I'm thinking a 3 spring short tail to replace the stock 2 spring long tail. Blows my mind how an unused amp just sitting can self destruct. I was foolish to have sent off for a tube immediately when a simple test of the tank leads would have told the tale. Thanks for the help!Comment
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