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svt4 pro - sounding a little farty

Discussion in 'Amps and Cabs [BG]' started by jcroxford, Jun 3, 2018.

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  1. Jun 3, 2018 #1
    jcroxford

    jcroxford

    Jan 7, 2017
    Sacramento CA
    So I just scored an svt4 pro with 2 pr410hlf cabs. When I was testing it out (in stereo) I didn't notice any issue, but then when I got it home and hooked up the bridge mono cord, it was lacking in power and distorted sounding. At first i though I made the cord wrong, but double checked it, and it was right.

    So I then tested out each amp side on its own, and its the B side amp. A side is clean w/ lots of power. B - farty, very low power.

    I was hoping maybe it was just a tube. So I bypassed the preamp, plugging a sansamp RBI in. A side fine, but B-Side same issue.

    Does this sound l like anything that can be fixed at home or easily? Or am I facing the repair shop. Any advice would be appreciated. THX!
     
  2. Jun 3, 2018 #2
    agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    No, this is not a home fix. The B channel power amp has a failure which is why you also experienced the symptoms in bridge mode (which places the amps effectively in series)

    Fins an Ampeg authorized service tech and it should be a straight forward repair.
     
  3. Jun 4, 2018 #3
    jcroxford

    jcroxford

    Jan 7, 2017
    Sacramento CA
    Thanks. I will try and find a service center around town.
     
  4. Jun 4, 2018 #4
    agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    See if Rainbow Electronics is Ampeg authorized.
     
  5. Jun 4, 2018 #5
    BasturdBlaster

    BasturdBlaster

    Feb 19, 2012
    Crandon WI
    My SVT4 did something similar to this and in my case it was the preamp in/ poweramp out jacks that needed to be cleaned. Maybe try some short patch cables in the FX loop and the preamp in/poweramp out loop on the "B" side of your amp.
     
  6. Jun 4, 2018 #6
    floridagatorfan

    floridagatorfan

    May 22, 2011
    Athens Alabama
    One of my 4pros had a cold solder problem. Maybe this could be part of the problem on yours.