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2ndary Voltage specs on A-0051463000 Power Transformer wanted

Discussion in 'Amp Central Station' started by gunsu69, Jan 27, 2021.

  1. Jan 27, 2021 #1
    gunsu69

    gunsu69 NEW MEMBER!

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    HI All,

    I've a Peavey Stereo 60/60 which has had its stock power tranny replaced with what seems to be a bit of a rare Sunn T50 PT. Number on my unit is A-0051463000. I'm wanting to find out what the secondary voltages are. I've measured but not sure whether the are right as they differ from the stock PT. Its one of these:

    https://reverb.com/item/1675743-genuine ... 0051463000

    Used in Fender / Sunn amps.

    I ask because the Peavey has had the power supply section of its PCB modified and I suspect this is to cater for different voltages .

    Any clues where I can get the winding voltage specs for this?

    Cheers [​IMG]
     

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    Last edited: Jan 27, 2021
  2. Jan 28, 2021 #2
    Wally

    Wally Telefied Ad Free Member

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    You have the PT there. The secondary voltages are there waiting to be [email protected] If you do not do this kind of work, you will have to pay a tech. Or...the schematic for the Sunn 50T is available at Fender Support. The B+ is 470vdc. One could make an estimate of what the secondary AC voltages are. My guess is that the unloaded secondary 350-0-350VAC or somewhere in that area...maybe a bit less??? That is just a guess.
     
  3. Jan 28, 2021 #3
    Wally

    Wally Telefied Ad Free Member

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    Oh....and Welcome to the forum.
     
  4. Feb 3, 2021 #4
    gunsu69

    gunsu69 NEW MEMBER!

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    Cheers Wally,

    Yep I did measure them and am getting 355-0-355 (am in Oz with 240v). What is interesting is that while I cant locate and original stock transformer p/n 70518705, I see a replacement at TAD stating the 2ndaries are 195-0-195. Mains transf. for Peavey VTM120,120W,230V (tubeampdoctor.com) Of course they may have it wrong :).

    Its working at any rate so possibly will let sleeping dogs lie. I had wanted to "undo" the tinkering as its not pretty. Peavey schematic is here if you're able to estimate? I'd be obliged.

    Its a beast of a thing!

    Cheers
     

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  5. Feb 3, 2021 #5
    Wally

    Wally Telefied Ad Free Member

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    I suppose I would be making a voltage chart of the circuit. If those voltages are good, one might assume that the person who did the work knew what they were doing despite the sloppiness.
     
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