1. #1

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    A friend of mine and I are racking our brains trying to get to get this to work and are looking for any insights. We have the PSU-Pre Power supply unit and the F-Pre pre-amp unit. We have it hooked up to a class D power stage and have determined that that is working properly. We have a loud 60cycle hum coming through the speaker, but no actual sound from guitar. Their documentation is not =very excellent.

    Pre amp-
    Tube Preamp Kit: Fender-Style (North American sound) - London Power

    Power supply-
    Tube Preamp Power Supply Kit - London Power Tube Amp Kits

    If anyone has had experience with these or know of anyone that could provide insights, that would be great.

    Last edited by Jonathan Levin; 12-09-2019 at 06:44 PM.


    The Jazz Guitar Chord Dictionary
  3. #2

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    I would contact Kevin O'Connor directly.
    I found him to very helpful and enjoyable when I contacted him about one of his books.

    Anyone build a London Power amp kit?-screen-shot-2019-12-09-5-27-47-pm-png

  4. #3

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    I agree. O'Connor is a solid fellow and helpful.

  5. #4

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    Thanks to both of you. The guy that is working with me is FAR more knowledgeable about this stuff than me. We've decided to try a new tube (12AX7) and replace one of the pots. When those arrive, we'll put them in. If no love, then we will go to Kevin O'Connor. Here are a few photos. I bought the Jensen Speaker from Vinnie(???) on this forum. I'd love to be able other something other than hum in the key of Bb.
    Attached Images Attached Images Anyone build a London Power amp kit?-img_4574-jpg Anyone build a London Power amp kit?-img_4572-jpg Anyone build a London Power amp kit?-img_4571-jpg 

  6. #5

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    Just out of interest, which Class D stage did you use? And for power?