Tweed Harvard & Vibrolux PT

Discussion in 'Amp Tech Center' started by jsnwhite619, Feb 14, 2020.

  1. jsnwhite619

    jsnwhite619 Friend of Leo's

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    On paper, a 5f10 and a 5f11 are separated by tremolo and voltages. A friend brought a recently acquired 5f11 Vibrolux in here today that is amazingly clean. The voltages are dead-on Harvard levels. 308v B+ and so forth. But, according to the old schematic, it should be upwards of 340v.

    So, did it get the wrong PT or was the schematic one of those wishful thinking models? What does a vintage Tweed Vibrolux normally run?

    [​IMG][​IMG]

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  2. Jon Snell

    Jon Snell Tele-Holic

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    A check on the -ve bias voltage will confirm the transformer winding but either way, it will work with no issues.
    The 5F11 has -ve 31v and the 5F10 -ve 27v.
     
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