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Pf-50t transformer imbalance?

Discussion in 'Amps and Cabs [BG]' started by tchristian, Nov 10, 2019.


  1. tchristian

    tchristian Supporting Member

    Nov 18, 2011
    Missoula, MT
    New to me Pf-50t. The right side transformer (looking from the front) gets hot to the touch after a couple hours of light/medium rehearsal. Not burning hot, just a little too hot to hold with my overworked, calloused, tradesman's hands. The left one stays room temperature cool. I just bought this amp used but it doesn't have a scratch or dent on it. Sounds fine at low/medium volumes.

    Does the design call for one to work harder than the other. Seems like a dumb question I guess. What am I missing? Need help, wanting to gig this amp Tuesday night.
     
    nbsipics likes this.
  2. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    2 completely different transformers, one is a power transformer and will generally run hotter because there are higher steady state losses which translate into heat.
     
    MattZilla, Zbysek, BrBss and 6 others like this.
  3. JimmyM

    JimmyM Supporting Member

    Apr 11, 2005
    Apopka, FL
    Endorsing: Ampeg Amps, EMG Pickups
    You're fine. Power transformer gets hot, output transformer doesn't.
     
  4. Stumbo

    Stumbo Wherever you go, there you are. Supporting Member Commercial User

    Feb 11, 2008
    Keep safe my TB brethren!
    Song Surgeon slow downer.
    When it's cold, stand next to the pt.
     
  5. Wisebass

    Wisebass

    Jan 12, 2017
    Lost in Space
    :D

    Back in the days we used to fry eggs on our power transformers,

    when we ran out of Japanese firewood. :laugh::roflmao:


    greetings

    Wise(b)ass
     
  6. tchristian

    tchristian Supporting Member

    Nov 18, 2011
    Missoula, MT
    I realize that name-calling, especially on a public forum where all you have to do to "run and hide" is put the phone down, is childish. But you fellas are a bunch of gentlemen. There, I said it. Ban me if you will. :D

    Many thanks!
     
    Clutchcargo, mcnach, pasmithy and 3 others like this.
  7. Cave Puppy

    Cave Puppy "Humph Bo, he's wond!" - John Lennon

    Jan 13, 2015
    Yep .. what all these folks said. The hot one is the power transformer. I have used mine to keep my hands warm in the winter! And nominal operation, too. You're good!
     
    Iristone and Zbysek like this.
  8. beans-on-toast

    beans-on-toast Supporting Member

    Aug 7, 2008
    A space heater for those cold Montana nights. Turn off the lights and enjoy the warm glow of the tubes while listening to music. You're good.

    If the amp is cold, let it warm to room temperature before powering it up. Best not to thermally shock it.
     
  9. byacey

    byacey

    May 16, 2008
    Alberta, Canada
    Ban? I must have missed something regarding any name calling happening here.

    If it should ever happen that the output transformer is getting hot, it would be best to get the amp to a technician
    for a check.
     
  10. tchristian

    tchristian Supporting Member

    Nov 18, 2011
    Missoula, MT
    Thanks for the heads up; I'll always now keep a watch on the output transformer too. And all you missed was my poor attempt at light humor. ;)
     
    JimmyM, Engle and agedhorse like this.
  11. Wesley R

    Wesley R Gold Supporting Member

    I have seen hot dogs cooked on nails that were plugged in to the banana plugs on Crown power amps (granted a couple of decades ago).
     
  12. Jeff Scott

    Jeff Scott Rickenbacker guru..........

    Apr 11, 2006
    A friend of mine has an Audio Research power amp that makes for a very nice space heater.
     
    Stumbo likes this.
  13. Yep the power transformer gets pretty warm when you work it at a gig - enjoy!
     
  14. JimmyM

    JimmyM Supporting Member

    Apr 11, 2005
    Apopka, FL
    Endorsing: Ampeg Amps, EMG Pickups
    I thought it was pretty decent. A little Hallmarkish :D but it sure beats some of the other things I've been called.
     
    tchristian likes this.
  15. blowinblue

    blowinblue Kind of not blue. Supporting Member

    Nov 29, 2006
    SoCal USA
    I’ve been thinking about buying an Ampeg Pfffft 50. This is good info. I would probably ask the same question as the OP after touching the transformers. Now I don’t have to ask. Thanks.

    M. M.
     
    MattZilla, Zbysek, Wolford and 2 others like this.
  16. Iristone

    Iristone

    Jul 8, 2017
    Beijing
    You're buying a Pfffft 50? Beware if it pffffts out. :spit::roflmao:
     
    tchristian and blowinblue like this.
  17. blowinblue

    blowinblue Kind of not blue. Supporting Member

    Nov 29, 2006
    SoCal USA
    Glad to see our sense of humor tracks closely. For the record, my post was not a dig at Ampeg. I really have been drooling over that amp.

    M. M.
     
    Iristone likes this.
  18. tchristian

    tchristian Supporting Member

    Nov 18, 2011
    Missoula, MT
    Go for it. The drool should boil right off. :roflmao:
     
    agedhorse and blowinblue like this.
  19. JimmyM

    JimmyM Supporting Member

    Apr 11, 2005
    Apopka, FL
    Endorsing: Ampeg Amps, EMG Pickups
    Just remember that if you get the amp wet with drool and electrocute yourself, it's not covered under warranty.
     
  20. Bent77

    Bent77 Supporting Member

    Mar 6, 2013
    Colorado
    You called me a “mult” yesterday

    and I had to look that up...
    :laugh:
     
    MattZilla and JimmyM like this.

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