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How do I test my amp's loop?

Discussion in 'Amps [BG]' started by LongHairFreak, Feb 27, 2014.

  1. LongHairFreak

    LongHairFreak Supporting The Gold Gold Supporting Member

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    Hey TB

    My amp's from '71/'72 and I've no way to get skematics, so I've no idea if it's fx loop is series or parallel. Is there an easy way for me to figure this out w/o taking it to my tech?

    Thanks
  2. nashvillebill

    nashvillebill

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    What amp do you have?
  3. LongHairFreak

    LongHairFreak Supporting The Gold Gold Supporting Member

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    It's a West Fillmore.
  4. Jazz Ad

    Jazz Ad Mi la ré sol Gold Supporting Member

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    Plug something into the fx loop out. If you hear no sound, it's serial.
  5. LongHairFreak

    LongHairFreak Supporting The Gold Gold Supporting Member

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    Hmm. So,series cuts off the signal to get in line and parallel walks along side and I'd still have sound, right? Cool! Thanks.
  6. nashvillebill

    nashvillebill

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    You mean FX in, that's usually a switching jack; most FX out are not switching so they can be used as an additional preamp out.

    The preamp schematic is here by the way:

    http://westlabs.com/PreampSchem.HTML

    It's series.
  7. nashvillebill

    nashvillebill

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  8. LongHairFreak

    LongHairFreak Supporting The Gold Gold Supporting Member

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    HA! Yes, Google is great. I just feel ...'needy'? if I state the following every time I post something.
    I am blind, so I miss a lot on web searches and obviously I wouldn't be able to read a skematic if I did find it.


    Thanks very much for obtaining that information for me.
  9. BassmanPaul

    BassmanPaul Gold Supporting Member

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    It would be nice if only we could look at a pre-amp schematic that wasn't identical to a Fender!
  10. LongHairFreak

    LongHairFreak Supporting The Gold Gold Supporting Member

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    So is this West a Fender knock-off of sorts? I thought it was West's answer to Ampeg.

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