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Stereofying a Peavey XR684 mixer amp ?

Discussion in 'Electronic Repair' started by N_Cook, Nov 13, 2012.

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  1. N_Cook

    N_Cook Guest

    So called stereo mixer amp , 2 outputs, 2x200W as main and monitor but no
    PAN pots.
    While in there for a lot of minor problems, any relatively simple way to
    stereofy.
    Break the main bus line in two and feed sepatately into the PAs and have a
    basic (1 to4 ch to left and 5 to 8 ch to right ,with one or more feed/s
    parallel split into 2 ,say to ch1 and vh5 etc ) stereo output and add a sw
    somewhere to select Mono or Stereo options ?
     
  2. N_Cook

    N_Cook Guest

    The amp is in bits at the moment but according to the owner the 2x phono
    pairs allow using a standard stereo phono lead connection but the signals
    are summed and fed to the single bus to the single input of the PA amps, ie
    mono out .
     
  3. N_Cook

    N_Cook Guest

    I'd only seen the repair manual and was going by what the owner told me
     
  4. N_Cook

    N_Cook Guest

    ch5 and ch6 are down in level. Shared by SMD U500 dual op-amp and DC in
    that area ,different to the other channels , so changed it, and the same
    lack of throughput and same DC. Must be something else further upstream
    loading that area
    Will remove a 000 ohm to isolate to confirm first . I did not fully check
    ch7,8,9 initially as different structures but I think they were low as well
    , so something further upstream , requiring full dismantling as the boards
    overlap, c'est la vie
     
  5. N_Cook

    N_Cook Guest

    looks as though I'm leading myself up the garden path. ch5 and 6 of this
    unsuffixed xr684 are not as in the F suffixed version schemas that is out
    there and must have more gain farther upstream , in comparison to ch1 to 4
     
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