Help Ariand f34bMk1V

Discussion in 'DIY Discussion' started by Dave MacFarlane, Nov 20, 2015.

  1. Dave MacFarlane

    Dave MacFarlane

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    Fuse blew - did usual - removed all valves, left speakers in - blew again - found MR67 diode 5ohms either direction - got diagram forced out of Yarland - o/p and P.S, but didn't resemble P.S - 200 ohm res excluded and FW rect. not right diagram - no time to trace cct. - replaced MR67 and schottky diode, still blew fuse - need wizard to say - oh, that's OK, its just component x,y,z. - save my amp!
    Any ideas as to where to go next? I am not right up on valve Power supplies, and I can't figure the half schottky - only one side is connected.
    Dave.
     
    Dave MacFarlane, Nov 20, 2015
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  2. Dave MacFarlane

    peterkey

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    Did you solve this problem? I have same issue?
     
    peterkey, Apr 5, 2016
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  3. Dave MacFarlane

    Dave MacFarlane

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    Yes, Peter, I am proud and unproud to say - I should have removed the valves on the second attempt - I replaced the diodes yet again ( I had craftily ordered 4), and switched on with no valves - OK - then put back 1 valve at a time (Ionly did this with the el34's - from my experience, this is what goes - but you can do this with the little valves as well) - one of the valves supplied was slightly different shape than the rest - I left it till last - each time switching off between changes - lo and behold, that valve blew the diode - fortunately I had a matched pair EL34's from my Marshall guitar amp - replaced diode again - inserted new pair, and hey presto - hasn't hiccoughed in a year!
    If it proves to be a valve, buy a matched pair - you can get them from Watford valves, from about £30.00 matched pair.
    Good luck, feel free to come back to me.
    Dave.
     
    Dave MacFarlane, Apr 5, 2016
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  4. Dave MacFarlane

    Dave MacFarlane

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    Oh, I should have said - the fault was a heater/cathode short in the valve. If you want that explained, gimme a shout.
    Dave.
     
    Dave MacFarlane, Apr 5, 2016
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  5. Dave MacFarlane

    peterkey

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    I understand. Thanks for your reply :)
     
    peterkey, Apr 15, 2016
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  6. Dave MacFarlane

    Dave MacFarlane

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    Have you had any luck? did you manage to fix your amp? If you are short of specialists,
    If you need me, I can repair it for you for a small fee, and guarantee it.
    Dave.
     
    Dave MacFarlane, Apr 22, 2016
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  7. Dave MacFarlane

    peterkey

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    I will consider it.
     
    peterkey, Apr 27, 2016
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