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Lavardin amp rip cremated ----what now ?

Discussion in 'audio' started by JOHN VAN BAVEL, Mar 31, 2021.

  1. chartz

    chartz If it’s broke fix it!

    I’ll have it please. I love such challenges. I once followed the original designer’s project for years.
    That would be a great project.
     
  2. Dan K

    Dan K pfm Member

    Ditch that Blue Alps and go TKD for starters.

    The designer has rivited the transformer RF cover (which I assume is stainless) and then varnished the rivets. Not beyond the wit of man, just a pain.

    I'm reminded of the 8 off DAC chips inside the Metrum Octave - part numbers all ground off. Lovely :-/
     
  3. booja30

    booja30 pfm Member

    The tamper proof PSU case is probably hiding a no-name SMPS. :)

    But it's kind of annoying that you have to drill rivets and get metal shavings all over the place to service it, just to keep it a secret.
     
  4. chartz

    chartz If it’s broke fix it!

    An Alps Blue in an amp of this price is a disgrace.
     
  5. toprepairman

    toprepairman pfm Member

    There's absolutely nothing special about the amp circuit, nice box though.
    If it was mine I'd pull out the electronics and build something nice into it. Lots of options, Doug Self Blameless or a nice simple classA.
     
  6. chartz

    chartz If it’s broke fix it!

    No, don’t do that :eek: M. Perrot was a genius and his circuits were very special. They took him almost ten years to finalize.
    This thing has to be fixed. Definitely.
     
    Tarzan and Sue Pertwee-Tyr like this.
  7. S-Man

    S-Man Kinkless Tetrode Admirer

    Doubt it. There are 4 diodes near the main smoothing caps. There's no need for those unless the wasp box contains an inverter (AC-DC-AC) which is very unlikely indeed.
    Based on pics of earlier models there is just a toroidal transformer in there.
     
  8. booja30

    booja30 pfm Member

    I meant that as a joke that Lavardin wanted to hide that there was something really mediocre inside.
     
  9. S-Man

    S-Man Kinkless Tetrode Admirer

    Many years back the Audio Sythnesis designer told me that he had built a Blameless to see how it sounded. "Extremely bland" was his verdict.
    Make of that what you will, but I doubt it would please a Lavardin owner.
     
    nmtjb and Sue Pertwee-Tyr like this.
  10. S-Man

    S-Man Kinkless Tetrode Admirer

    Sorry, I will try to leave my anorak on the hook occasionally :D
     
    nmtjb and booja30 like this.
  11. chartz

    chartz If it’s broke fix it!

    If the PSU was indeed a broken SMPS (I hate those) I’d replace it with a linear, regulated one, as the original designer intended. He also published a series of articles on amplifier PSUs, mind you.
     
  12. JOHN VAN BAVEL

    JOHN VAN BAVEL pfm Member

    Just to give the background . L hand channel stopped working for no obvious reason . Sent to trusted technician . He said inside was all blackened and burnt and totally unrepairable --- only suitable as a boat anchor . I am now on the prowl for a replacement , either the same again or perhaps smaller Naim , [PRAT is important to my listening ] , Hegel , or other suggestions . Speakers are reasonable sensitive .
     
  13. maccar

    maccar pfm Member

    Do you have a budget in mind?
    Mac
     
  14. Dan K

    Dan K pfm Member

    Looking further at the pic... The amp is a pair of class A/B push/pull boards mirrored (upper and lower in the pic, about the blue Vishay PSU caps). It doesn't look a million miles away from the RCA/Naim/NCC200 circuit, but with more front end transistors and a couple of other embelishments.

    I should think that either Avondale, Witch hat or Class A could easily fix it. Odds are that a pair of the output devices have simply gone pop.
     
  15. Dan K

    Dan K pfm Member

     
  16. booja30

    booja30 pfm Member

    Can you post a photo of the inside of the amp? E.g. upload to postimage.org and then paste a link here. It could help narrow things (and options) down.
     

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