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Thread: The Bug is back

  1. #81
    Bigman80 Guest

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    Quote Originally Posted by Bksabath View Post
    Attachment 24428Attachment 24429Attachment 24430

    It start loosing shape at 60KHz
    I was going to post same current results but I have blown up (not surprising) one of the Output boards


    So more to follow ...
    Oh dear.

  2. #82
    Join Date: Sep 2018

    Location: Liverpool

    Posts: 14
    I'm Paul.

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    Oh no, feeling really gutted for you. I know how much work you have put into these Amps. No worries I'm sure it's only a minor setback.

  3. #83
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 766
    I'm Sandro.

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    Well I got it apart already and the negative board has 2 blown Mosfets
    I have already matched a god pair out of my stash

    It looks like the J fet is gone as well but again I got plenty of spares, this is a bit more upsetting because it is going to be one less pair that I leave to my grand children's
    It should be back on later on
    Positive thing about it the speaker protection works




    DSCF2353.jpgDSCF2354.jpg

  4. #84
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 766
    I'm Sandro.

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    DSCF2356.jpgDSCF2357.jpgDSCF2358.jpgDSCF2359.jpg


    Back on after changing the power dudas
    Found cause of blow up as well, little strand of wire on the pot I was using to set the volumes went the wrong way

    Any way
    It has been cooking overnight
    Offset is on the mV mark and the temperature on the sinks at a conservative 35 C
    I have set the bias at 0.35 V on the resistors

    Here is the output at 1Khz ~

    I am using 4 30W 1R in series and they do get hot
    Attached Images Attached Images

  5. #85
    Join Date: Mar 2010

    Location: Sheffield

    Posts: 2,898
    I'm Simon.

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    Looking good.
    Kuzma Stabi/S 12", (LP12-bastard) DC motor and optical tacho psu, Benz LP, Paradise (phonostage). MB-Pro, Brooklyn dac and psu, Bruno Putzeys balanced pre, mod86p dual mono amps, Yamaha NS1000m

  6. #86
    Join Date: Sep 2018

    Location: Liverpool

    Posts: 14
    I'm Paul.

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    looking good, sounding amazing went round for a visit today, one of the mono amp needs a little more setting up but the sound is totally awesome.

  7. #87
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 766
    I'm Sandro.

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    Quite a few things to do bit of hum whit the XP10 at max

    Earth lift or not to earth lift

  8. #88
    Join Date: Sep 2013

    Location: North Island New Zealand

    Posts: 1,757
    I'm Chris.

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    Quote Originally Posted by Bksabath View Post
    Quite a few things to do bit of hum whit the XP10 at max

    Earth lift or not to earth lift
    Just earth, however do so using star connection. If you have hum across audio signal, consider the benefits of
    using encapsulated opto resistive attenuation ie LDRs, The NSL32SR3 in particular, as they provide black silence at all volume levels .

  9. #89
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 766
    I'm Sandro.

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    There is a 40 mm wide and 3 mm thick plate connecting the capacitors and all the grounds I will get same SY 2.5 CSA cable for the supply cables
    Just ned to look at the earth lift and maybe a DC suppressor, 4 big caps and diode bridge.

    When I say loads of hum this is compared whit my F5s' ear close to the speakers and the XP10 at max can't hear a thing from a meter away


    Finishing the enclosures will also help


    Just a few holes to drill for those


    No much else to report apart that they have been on for a couple of days at idle to do same burn in and form the capacitors


    They should be in the new home in the next few days


    I will post pictures before they go


    And then I can start on the other set

  10. #90
    Join Date: Mar 2017

    Location: Liverpool

    Posts: 766
    I'm Sandro.


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