Low reverb output on 1964 6G15 reverb after hard fall

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by brad347, Jan 27, 2012.

  1. brad347

    brad347 Member

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    My cat knocked my 6G15 reverb off of a height of about 5'.

    Afterward, the reverb effect was much less pronounced than before... with all controls maxed, you can make out some reverb, but not a normal amount. I'm pretty handy, so "simple fix," I thought. I was wrong.

    Here's what I've done.

    Tried 3 separate original Gibbs/Hammond tanks with the correct impedance ratio, including one known-good from a Super Reverb whose reverb was working well.

    Tried at least one additional known-good tube in each position.

    Swapped reverb and input/output cables.

    Verified that the locking mechanism on the tank was disengaged.

    Checked all voltages listed on the schematic/layout; all checked as normal

    Visually inspected all connections inside unit (nothing amiss).

    Tested for continuity on all connections for wires that run under the eyelet board (all good).

    Cleaned and re-tensioned all tube sockets.

    Checked footswitch jack and tested both with footswitch engaged and disengaged.

    Verified that the guitar and amp were plugged into the correct jacks.

    ...

    At this point, I'm not sure what else to check for. The only thing I can think is... partial short in either the primary or secondary of the OT? I've never known that to happen as a result of a fall from height, but I suppose it's possible. Any ideas/thoughts are appreciated. I'm not really used to something happening with a Fender amp-like product that I can't diagnose and fix myself, but this one really has me stumped.
     
  2. 900z1

    900z1 Member

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    I know it's a long shot, but is it possible one of the the pots got damaged either directly or by the shock ? is it possible that a ground came loose somewhere in the reverb level control ? or a short from hot to ground in the reverb controls ? I suspect this because you said you get faint reverb, just not very strong..
     
  3. brad347

    brad347 Member

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    Thanks for the reply. I checked every ground I could find, and verified that all 3 pots were functioning correctly from a resistance standpoint.
     

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