845 SET monoblock stone cold dead - any idea who can service these?

Discussion in 'DIY Discussion' started by Dynamic Turtle, Oct 24, 2006.

  1. Dynamic Turtle

    Dynamic Turtle The Bydo Destroyer

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    Hey folks,

    Well, it appears that one of my Ming-Da 845 monoblocks has died. Tried changing plugs/fuses/valves, all to no avail. It's dead as a dodo! Before you ask, it is a 240V model. Though of course, I have no way of checking this and it could very well be a re-badged 220V model - I wouldn't put anything past those Chinese manufacturers! Incidentally, the other monoblock works perfectly and shows no signs of dying. Yet...

    I bought them from Ben at Chinese Hi-Fi and have e-mailed him as they are still under warranty. However, I really don't fancy sending them all the way to France, what with the customs/costs/risks involved.

    So I was wondering if you know anyone that has serviced this type of SET before (ideally in London, but not essential)? I should be able to get the circuit diagram from Ming-Da. Any idea what it would cost to fix? Ballpark figures?

    Cheers,
    DT
     
    Dynamic Turtle, Oct 24, 2006
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  2. Dynamic Turtle

    murray johnson

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    Hi DT,

    It depends what's failed. Did it fail with a bang or did it just not come on at all? Is it blowing the fuse each time you replace it? Can you try to get the schematic?

    rgs
    Murray
     
    murray johnson, Oct 24, 2006
    #2
  3. Dynamic Turtle

    Dynamic Turtle The Bydo Destroyer

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    Hi Murray,

    Have no idea what failed. It died quietly though - no bangs/pops/smoke/odour etc. She passed-on peacefully, so to speak!

    Will try to get the schematic. Hopefully Ben can get it from Ming Da. Having said that, whilst I haven't popped the case open (and never would) The circuit looks pretty simple from the pics I've seen.

    Rgds,
    DT
     
    Dynamic Turtle, Oct 24, 2006
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  4. Dynamic Turtle

    Anex Thermionic

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    The circuits are extrememly simple in SE amps. Take the lid off! Do it!:)
     
    Anex, Oct 24, 2006
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  5. Dynamic Turtle

    zanash

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    I'm sseeeiinngg ddoouubbllee
     
    zanash, Oct 24, 2006
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  6. Dynamic Turtle

    T-bone Sanchez

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    If your not happy playing around in amps I wouldnt do it!

    May well be the fuse as mentioned. I dont know the amp but the fuse in usually in the same unit as the IEC input.
     
    T-bone Sanchez, Oct 25, 2006
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  7. Dynamic Turtle

    bottleneck talks a load of rubbish

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    I can only echo this, as moderators we don't want people with no confidence encouraged to wave soldering irons around inside amplifiers!

    If you are confident and are happy with the risk, that is different.
     
    bottleneck, Oct 25, 2006
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  8. Dynamic Turtle

    SCIDB Moderator

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    Hi Chris,

    Well said!

    If you have no experience of circuits, always be wary. An amplifier using 845 valves could have in excess of 1000V knocking about inside.

    SCIDB
     
    SCIDB, Oct 25, 2006
    #8
  9. Dynamic Turtle

    AndrewR

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    One of the best people to contact is Philip from www.bluebellaudio.com - he services hi-fi and guitar valve amps.

    Andrew
     
    AndrewR, Oct 29, 2006
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