wiring the mains on the power transformer for 230V

Discussion in 'Shock Brother's DIY Amps' started by Dimitree, Oct 22, 2021.

  1. Dimitree

    Dimitree Tele-Meister

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    hi guys, I'm going to wire this power transformer for my Princeton Reverb build:

    https://www.hammfg.com/files/parts/pdf/291AEX.pdf

    I live in EU and the mains voltage at my house is 230V.
    Should I match 230V by using those taps

    - blue/yellow (110V)
    - brown connected to black (120V)
    - white (0V)

    or should I simply tap at blue and white (and still brown connected to black) to aim at 240V?
     
  2. kbold

    kbold Friend of Leo's

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    Since it's there, use the 230V tap. Seems to have taps to cater for various mains voltages.
     
  3. LightningPhil

    LightningPhil Tele-Meister

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    I'd question whether it really is 230V where you live. If you've got a meter, measure it at the time of day you usually play the guitar. Ideally a few other times of day too.

    The 230V is a compromise between 220V and 240V grids while allowing them to remain unmodified and remain within 10%.

    However, in the dodgy old bit of the UK where I live, with our creeky wiring, the highest I've seen it is 258V. It's also browned out my PC by dropping below 200V - that was caused by a network fault though.
     
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  4. King Fan

    King Fan Poster Extraordinaire Ad Free Member

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    Those Hammond diagrams make my brain hurt. How exactly does he wire it for 230, assuming it is 230?

    4EBA5F92-556D-430F-8DB4-EA30F8467DC7.jpeg

    As for where to aim, besides actual wall measurement, which HV tap will you use (?maybe the 325), and what’s your target B+? If you had 230 at the wall, 240 wiring would knock your B+ down a bit, which some builders or amps appreciate — and some don’t.
     
  5. Paul-T

    Paul-T Tele-Holic

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    You can connect white to neutral, join black to brn, then blue/yel to hot for 230V (120 + 110). i think that's the only combination as the other combination gives 220.
     
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