120 to 220 v conversion - tweed champ 5F1

Discussion in 'Shock Brother's DIY Amps' started by flyinjack, May 14, 2019.

  1. flyinjack

    flyinjack TDPRI Member

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    Screenshot_20190514-064626~2.png IMG-20190515-WA0000.jpeg


    Hello all,

    I am trying to convert a 5F1 tweed champ kit from 120 V to 220 V. I have attached the power transformer info as well as what I think the correct wiring is. Could someone please check my wiring plan? I'm not sure that my idea is correct.

    Thank you!
     

    Attached Files:

  2. robrob

    robrob Poster Extraordinaire Ad Free Member

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    Is the amp currently using the PT's black & white wires for 120V? If yes, then the black and black/yellow wires should work for 220V.
     
  3. flyinjack

    flyinjack TDPRI Member

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    That was a super fast response. Thanks!

    Yes, it's currently wired with the white/120v and black.
     
  4. jhundt

    jhundt Doctor of Teleocity

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    may I ask why you want to convert it to 220?
     
  5. flyinjack

    flyinjack TDPRI Member

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    I am taking the amp overseas and need to modify it to work easily there. It’s a clone build so I figure no harm done, and it would make for a fun project.
     
  6. Finck

    Finck Tele-Afflicted

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    Just wonder, is the filaments' secondary really 3.15V?
     
  7. robrob

    robrob Poster Extraordinaire Ad Free Member

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    How are your amp voltages with the 120v hookup? If they run high like many modern amps you may want to use the 230v wires to bring down the voltage a little. And are you sure the voltage over there is really 220? Many countries are running 240 and above. If you use the 220v wires and you actually get 230+ voltage you'll get an extra 20 or 30 volts of B+.
     
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  8. Dacious

    Dacious Poster Extraordinaire

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    If it's only temporary get a 115 volt stepdown.
     
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  9. Dacious

    Dacious Poster Extraordinaire

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    Each leg to ground is. AC it's 6.3
     
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  10. flyinjack

    flyinjack TDPRI Member

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    I work out of Dubai, UAE and have a home setup over there with quite a few of my toys. I have this mojotone 5w tweed champ and it would be a perfect amp to have there.
    The amp has the multi tap power transformer that I listed above, so I'm thinking it should be a very simple process. I'll give it a try when I get back in a couple days.

    As far as power goes everything I read claims to be 220v and 50 Hz. I have gone the stepdown transformer route in the past, but this small amp is going to be a permanent fixture there so I might as well do it the right way.
     
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  11. Finck

    Finck Tele-Afflicted

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  12. Dacious

    Dacious Poster Extraordinaire

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    Just get a DMM and (carefully) check the wall voltage. As RobRob says often 110 volts turns out to be 115. Here 240 is 245-247.

    OTOH, I had two SF Champs - one I fitted a 240v transformer for Oz, the other ran through a 110v stepdown, both had exactly the same B+ which was 15 volts over the scheo but well within tolerance, I think through a tube recto the Champ P/t won't generate really high voltage regardless of wall voltage.
     
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