The Dynaco Tube Audio Forum

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The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Tubes4hifi VTA tube amp and preamp kits and all Dynakitparts.com products


2 posters

    mark iii failure on startup

    daniel a
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    daniel a


    Posts : 8
    Join date : 2013-12-26
    • Post n°1

    mark iii failure on startup Empty mark iii failure on startup

    Post by daniel a Thu Dec 26, 2013 4:08 pm

    Approx 10 seconds  after startup Mark iii produces loud crackling noise and KT88 flashes
    and small amount of smoke from inside chassis. Odor near quad cap which was replaced 6
    years ago with Dynakit german quadcap.  Replace quadcap with SDS cap board and now a
    loud hum on startup. Any ideas ?     Thanks
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    wrat
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    wrat


    Posts : 2
    Join date : 2013-12-24
    • Post n°2

    mark iii failure on startup Empty Re: mark iii failure on startup

    Post by wrat Fri Dec 27, 2013 1:34 am

    bad tube? quad cap failure caused by runaway tube? over voltage?
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