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Accutronics reverb tanks

Discussion in 'Electronic Repair' started by Phil Allison, Jul 2, 2013.

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  1. Phil Allison

    Phil Allison Guest

    ** Hi,

    do any people here regularly attempt to fix these things or just replace
    them ?

    I get a lot of dead and bad sounding units - used to be only very old ones
    but now most are in new looking condition.

    Accutronics ( now Accutronics / Belton) have made a couple of major blunders
    in recent years - first they added little white plugs to the drive and
    pickup coils and then they added a foam plastic impact pad under the

    The white plugs were a disaster since they impacted at the ends of the metal
    box and caused the hair fine wire on the pick up coils to break. The foam
    plastic pad was a time bomb - eventually it perished and turned into fine,
    sticky particles that coated the springs and damped the torsional vibrations
    so much there was no more reverb.

    I have found good fixes for the white plug ones and ones with broken feed
    wires and even ones that have the tiny magnets resting in contact with the
    laminations of the drive and pickup coils.

    Cleaning springs coated with sticky foam particles with solvent ( even
    Acetone ) has not proved a complete success - the resulting sound is still
    sub standard.

    Guitarists love these things but I wish they would treat them with more care
    as many I see have been subjected to massive impacts - over and over. I know
    this for sure when I see lose and missing steel pins that are intended to
    limit movement of the sub frame !!

    The fix or this last one is to drill out the holes and fit 4x30mm size bolts
    in place.

    Bloody heck !!

    ..... Phil
  2. Phil Allison

    Phil Allison Guest

    "Gareth Magennis"

    ** 90% of those can be fixed, long as they are the kind with white plugs.

    Normally, the hair fine wire breaks just were it is soldered to the pin -
    mostly only one but I have seen both. You need strong light, close up
    glasses, a fine tipped iron and a steady hand - plus a strand of tin
    plated hook up wire.

    Want more ?

    ** I seem to collect modules from powered speakers that defy all attempt at


    If you can get the magnets off the back of 12 inch speakers, the fames make
    dandy pot plant stands.

    ..... Phil
  3. Phil Allison

    Phil Allison Guest

    "Gareth Magennis"

    ** Errr - holding doors etc open on windy days is one.

    I use any available tranny or SLA battery as dead weight when gluing wood
    with Aquadhere.

    So, am I the only Accutronics tank fixer out there ?

    .... Phil
  4. Phil Allison

    Phil Allison Guest

    ** The vast majority of Accutronics reverb unit have this written on them:

    CARY IL.

    Very recent ones are branded:

    " Accutronics & Belton Seoul Korea "

    ** I don't think you have seen many Accutronics ones then.

    ..... Phil
  5. N_Cook

    N_Cook Guest

    Order of filures I find, all repairable
    corrossion of phone/RCA sockets
    tails vibrate and break at sockets, resolder and swathe in hot melt
    failure of spring anchor, get into the anchor area and if magnet is
    missing break up a rare earth magnet and glue the pieces around the wire
    like a cylinder
    brak in the coil of fine wire end - scrape an exposed piece of enamel to
    establish if at the tightly wired solder point , solder in a jumper,
    if inside the coil rewind with the finest wire you can find , random
    scatter wound on a hand drill is fine, as many turns as you can get on
    there and remount , or 200 ohms or so if very fine wire
    all repaired in jobs taking les than an hour
  6. Phil Allison

    Phil Allison Guest

    "Nutcase Kook"
    ** Is this dude a fanatic or what ??

    .... Phil
  7. Phil Allison

    Phil Allison Guest


    ** The problem you mention occurs with USA made units, but only when they
    are quite old and the feed PVC wire coating gets brittle.

    ..... Phil
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