Help with amplifier

Discussion in 'General Electronics Chat' started by somewhereinusa, Oct 5, 2013.

  1. somewhereinusa

    Thread Starter New Member

    May 14, 2012
    2
    0
    Real new here. I'm not sure this is the right place to ask, if not I apologize.I'm working on an old Newcomb amp. I'm pretty sure that all that is wrong with it is a bad transformer. I've done much searching and can't seem to find what I need. I've posted a wiring diagram and a picture of the transformer here. Electronics I'm pretty sure I need 45v, but that's all I have been able to determine.I've done a lot of searching and can't seem to find a supplier for this kind of transformer, perhaps I'm searching for the wrong thing?


    Thanks in advance,
    Dick
     
  2. MrChips

    Moderator

    Oct 2, 2009
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    What makes you think the transformer is bad?
     
  3. somewhereinusa

    Thread Starter New Member

    May 14, 2012
    2
    0
    The input and output windings are shorted
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,564
    2,379
    I would have though a transformer that size should not be a problem, Hammond are one of the largest manuf. for small transformers, also try DigiKey.
    You may have to change the Ind. lamp set up or voltage?
    Max.
     
  5. tubeguy

    Well-Known Member

    Nov 3, 2012
    1,157
    197
    Actually you need about 33 to 34 volts for the transformer secondary. The FWB DC output is approximately the peak AC voltage minus diode drops.
     
    Last edited: Oct 5, 2013
  6. MrChips

    Moderator

    Oct 2, 2009
    12,449
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    You don't need an exact replacement. I would ignore the lamp requirement and worry about that later. I would think a transformer with 36VAC output should work.
     
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