When reverb tanks die...

Discussion in 'Amp Tech Center' started by charlie chitlin, Dec 14, 2018.

  1. charlie chitlin

    charlie chitlin Doctor of Teleocity Silver Supporter

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    ...what happens to them?
    '68 Pro Reverb with the original Accutronics tank and very weak 'verb.
    When I try the tank from a DR, it sounds great, so it's the tank.
    It sure LOOKS like every working tank I've seen the insides of.
    Springs connected, wires connected...
     
  2. mally

    mally Tele-Holic

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    **** happens ! But at least they are cheap
     
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  3. mally

    mally Tele-Holic

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    **** happens ! But at least they are cheap
     
  4. flyswatter

    flyswatter Friend of Leo's

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    One thing that can go is the transducer at either end of the tank (one for input, one for output). They have tiny little coils in them that can break or fail over time. I've repaired tanks by grafting in a new transducer from another old tank, but it's a finicky process.
     
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  5. JMac52

    JMac52 Tele-Meister

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    I had one that made an awful kerrang noise only on certain notes. Couldn’t see anything wrong with it either.
     
  6. jrblue

    jrblue Tele-Afflicted

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    I assume you have checked all the connections and that you're not just losing signal. It's probably the transducer.
     
  7. Wally

    Wally Telefied Ad Free Member

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    Charlie, a multimeter will tell you if a transducer ...or a connection to a transducer...is bad.
     
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  8. printer2

    printer2 Poster Extraordinaire

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    They go to reverb tank heaven?
     
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  9. tubejockey

    tubejockey Tele-Meister

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    or somebody replaced it with the wrong tank. You can sometimes get more performance from a tank by eliminating the slop from the transducers with a drop of epoxy. Put a drop on the spring connections as well.
     
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  10. bcorig

    bcorig Tele-Afflicted Silver Supporter

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    Only the good ones go back to Corona.
     
  11. Bendyha

    Bendyha Friend of Leo's Silver Supporter

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    Virtuous ones are boing again.
     
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  12. jackal

    jackal Friend of Leo's Gold Supporter

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    I always just replace the with a MOD tank, always an improvement.
     
  13. ScottJPatrick

    ScottJPatrick Friend of Leo's

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    And they say Germans don't have a sense of humour, very subtle bendyha, thought you were nearly going down this line for a second, https://bjornagain.com/ Now I wonder if Abba originally got their name from an Accutronics reverb tank code.......
     
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  14. bwacke

    bwacke Tele-Meister Gold Supporter

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    Years of bouncing around during transport stretches the springs and they lose their structural resilience. The stretchy springs elongate and attenuate the desired signal. They'll sometimes be sloppy enough to drop to the floor of their mounting area in the cabinet or bag and become a seismometer that thunders with every step a nearby band member makes on the stage. If you're very careful, it's possible to clip a turn out of the springs and bend a new hook to tighten them up. But that operation is delicate and risky.
     
  15. jman72

    jman72 Tele-Afflicted

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    I have a similar tank from a 70s Pro Reverb that seems to be intact (and the transducers seem to measure ok with my multimeter), but the reverb is very weak (even on 10 it sounds like a 2 or 3). I switched out the tank from a SFTR, and it works great, so I know it's the tank, but there is nothing obviously wrong with it. I guess I'll just buy a replacement.
     
  16. Bob Womack

    Bob Womack Tele-Afflicted

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    I've heard that the sound is something like what you hear When Doves Cry.

    Bob
     
  17. wanderin kind

    wanderin kind Tele-Meister

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    usually the coil in the pickup transducer,

    too cheap for a new tank even at $18.95?

    vegan glutton free type who hates landfill?

    drill out rivets, un lace core, careful not to bend the nickel lams as they lose permeabillity (so you lose signal)

    slide coil off by bending lams (wait, didn't you just tell me...), unwind coil, find a used pickup with an open coil, lay pickup on the ground, put bobbin in a 1/8" drill bit, hook to drill, wind as much #44 as will go on there, s/b over 2000 turns but how would you know?

    re-install coil, solder leads, play some dick dale music, repeat as needed,

    oh and good luck with those tiny magnets on the piano wire,
     
  18. uriah1

    uriah1 Telefied Gold Supporter

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    Repair is pain in butt. Been there..
    Get new
     
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  19. TeleDrifter

    TeleDrifter Tele-Afflicted

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    I have a accutronics 9 1/2 inch 3 spring reverb tank. I get 60ohms on the input side & 207ohms on the output side. Are these normal readings for a functioning reverb tank? The red lead from the amp read 5ohms, the black lead reads 20ohms. I'm not sure which is for the out & which is for the in. This is for a Fender M-80 head. Is there a way to check the signal coming from the amp?
     
  20. Bill Moore

    Bill Moore Tele-Afflicted Silver Supporter

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    Red usually is input for Fender.
    Accutronics has a chart online to find impedance with resistance measurement.
     
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