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    Transformer orientation and spacing

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    rodster

    Posts : 2
    Join date : 2016-06-20

    Transformer orientation and spacing Empty Transformer orientation and spacing

    Post by rodster on Sun Dec 18, 2016 10:04 pm

    For a while I've been collecting parts to do a build.
    Have dynakit Power, transcender output, VTA octal driver and for power supply I can do component, quad or the board.
    Tubes I have available are GL KT88, 6N8S, GZ37 and 5AR4 rectifier tubes.
    Figured I have enough to get started laying things out.
    When I first started I orientated the transformers 90 Degree to each other.  Then I remembered about some chokes I had in a drawer.
    I like the way it looks with all 3 transformers but can't help to feel it's just not right.  Not sure of orientation, but really concerned about spacing.
    Can I get someone to set me straight and give some recommendations?
    Thanks



    Transformer orientation and spacing 6yj8352m5vmt
    arledgsc
    arledgsc

    Posts : 493
    Join date : 2012-11-30
    Location : SF Bay CA

    Transformer orientation and spacing Empty Re: Transformer orientation and spacing

    Post by arledgsc on Mon Dec 19, 2016 11:20 am

    I would orientate the transformers as shown in your pictures.  I built a guitar amp that did have the PT and OT 90 degrees but the center lines of the xfrmers weren't lined up. As a result I had 60 cycle hum in the speaker as soon as the PT was switched on irregardless of the B+ standby switch.  It was a bear to figure out that the PT heater winding radiation was coupled directly to the OT.  Solution was to remove OT and relocate it 1/4" further away and inline with the center of the PT.
    sKiZo
    sKiZo

    Posts : 1533
    Join date : 2013-04-01
    Location : Michigan USA

    Transformer orientation and spacing Empty Re: Transformer orientation and spacing

    Post by sKiZo on Mon Dec 19, 2016 8:51 pm

    Pretty tight ... maybe downsize the OT's and save those monsters for another project.

    * I suppose changing the orientation to put the iron on the long side is out of the question?
    Kentley
    Kentley

    Posts : 502
    Join date : 2015-03-06
    Age : 66
    Location : Worcester, MA

    Transformer orientation and spacing Empty Re: Transformer orientation and spacing

    Post by Kentley on Mon Dec 19, 2016 9:52 pm

    "I suppose changing the orientation to put the iron on the long side is out of the question?" {sKiZo}

    My first thought exactly.
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    rodster

    Posts : 2
    Join date : 2016-06-20

    Transformer orientation and spacing Empty Re: Transformer orientation and spacing

    Post by rodster on Mon Dec 19, 2016 10:05 pm

    Looks can be deceiving,
    Actually 12.5" wide 12" Deep

    Probably best to leave the large size choke off the top and use the C-354 CHOKE underneath.
    tubes4hifi
    tubes4hifi
    Admin

    Posts : 1557
    Join date : 2008-11-30

    Transformer orientation and spacing Empty Re: Transformer orientation and spacing

    Post by tubes4hifi on Tue Dec 20, 2016 12:32 pm

    yes, I think your last though is correct "Probably best to leave the large size choke off the top and use the C-354 CHOKE underneath."
    Then spread the transformers farther apart and keep them oriented as is (90 degrees from each other)

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