OEM 5E5 Output transformer specs

Discussion in 'Amp Central Station' started by Intubator, Aug 25, 2019.

  1. Intubator

    Intubator Tele-Meister

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    I'm building a slightly modified 1955 5E5 tweed clone and was wondering if anyone has the exact specs for the primary and secondary impedances as well as the exact wattage rating for the OT? I have found one that I believe is close but only rated at 25W, I think the original was 30W?.. Thanks!
     
  2. RottenTheCat

    RottenTheCat Tele-Meister

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    No idea of the original specs, but just wanted add that transformers have impedance _ratios_, not impedances. You need something around 500:1 to 550:1 rated for the wattage you'll be creating. Just keep in mind if you're using a modern power transformer, the wattage produced will be quite a bit higher than the old original ones. An example it's not unusual for a 5f4 to produce just over 40 watts when using iron that's more commonly available.
     
  3. RottenTheCat

    RottenTheCat Tele-Meister

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    And I should have added the impedance ratios assume an 8 ohm speaker.
     
  4. Wally

    Wally Telefied Ad Free Member

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    5E5 or 5E5A?? Whichever, Mercury Magnetics would be my choice for the OT. +1 with
    RottenTheCat’s observation that the PT needs to be selected with care. MM would have the details for that as well. They don’t share those details, but they build to the specs.....and adjust for voltage differences.
     
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