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

    MK IV fuse

    WPFW893FM
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    WPFW893FM


    Posts : 14
    Join date : 2019-05-12
    • Post n°1

    MK IV fuse Empty MK IV fuse

    Post by WPFW893FM Sat Jun 15, 2019 9:27 am

    I always get agitated when these things happen. Anyhow the MK IV blew a fuse this morning. Blew a second one also I watched real close the rectifier tube seemed to arc? spark in its envelope. Had a similar problem with the other amp about a month ago put in a dif 5ar4 and it was fine. I guess those mullards I bought new the rec tubes are not built to last past 14 months or so? Who knows that would be the best answere for me right now. Have to dig one up or order two more.
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    Roy Mottram
    Roy Mottram
    Roy Mottram
    Admin


    Posts : 1839
    Join date : 2008-11-30
    • Post n°2

    MK IV fuse Empty Re: MK IV fuse

    Post by Roy Mottram Sat Jun 15, 2019 1:53 pm

    replace rectifier tube and fuse. replace quad caps if they are more than 10 years old.
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    WPFW893FM
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    WPFW893FM


    Posts : 14
    Join date : 2019-05-12
    • Post n°3

    MK IV fuse Empty MK IV fuse

    Post by WPFW893FM Mon Jun 17, 2019 1:19 pm

    Yes I did replace the fuse and the rec tube in that unit and the one next to it. Want to hear the whole story of it.?
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    • Post n°4

    MK IV fuse Empty Re: MK IV fuse

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