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Winding transformer

Discussion in 'Electrical Engineering' started by Jimmie, Feb 12, 2005.

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  1. Jimmie

    Jimmie Guest

    I need a transformer for an audio amp, cant find a replacement for less than
    $120. Transformer has a couple of windings on the secondary. 32vac each side
    of the center tap, 18volts ac for the preamp stage and 6 volts for lights.
    I Have a couple of old VARIACs that the mechanical parts are bad/missing. I
    was thinking of using one of these as the primary for the transformer and
    hand winding the secondary. I am figuring about .6volts a turn. Any reason
    why these would not work.
     
  2. Brian

    Brian Guest

    What is your tolerance?


    I need a transformer for an audio amp, cant find a replacement for less than
    $120. Transformer has a couple of windings on the secondary. 32vac each side
    of the center tap, 18volts ac for the preamp stage and 6 volts for lights.
    I Have a couple of old VARIACs that the mechanical parts are bad/missing. I
    was thinking of using one of these as the primary for the transformer and
    hand winding the secondary. I am figuring about .6volts a turn. Any reason
    why these would not work.
     
  3. Dave D

    Dave D Guest

    I don't think that's a very graceful way to achieve what you want to be
    honest.
    Why not use a large, more readily available 32-0-32 transformer for the
    power amp, and a seperate transformer(s) for the preamp and lights? The
    latter transformer(s) shouldn't need to be very big and you should be able
    to find space in all but the most packed amps.

    Dave.
     
  4. Paul Miller

    Paul Miller Guest

    comes down to.. if the jobs worth doing......
    $120 isnt a lot, depending on the current draw of the system...

    Paul Miller iEng MIIE (elec)
     
  5. Jimmie

    Jimmie Guest

    Well just went ahead and did it, It seems to work fine. Think I will take
    that $120 I saved and take my wife out to dinner.
     
  6. Jimmie

    Jimmie Guest

    Not to mention finding a torodial core.

    I had two identical amps, That how I knew the voltage of the transformer.
    Funny thing ,since I changed the transformer the amp sounds better. I cant
    quite describe how. Think it may be because I didnt really have the right
    wire for the current rating of the amp so I used some 12 guage enameled wire
    I had around. This was a lot bigger than what was in the old
    transformer.Think I am going to do this to the other amp now.
     
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