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


    New member and proud owner 70A

    crashb4
    crashb4


    Posts : 13
    Join date : 2016-01-07
    Age : 62
    Location : Monson, Ma.

    New member and proud owner 70A Empty New member and proud owner 70A

    Post by crashb4 Sat Jan 09, 2016 2:41 pm

    Greetings all,
    New member here. Be gentle. I just received my ST-70A that I have been coveting for some time. The unit is in overall good condition and I got a heck of a deal on it. I am in the process of conducting an inventory on it and came across a toasted resister 15.6 on V7 leg 1 to ground. There was sufficient heat to discolor the adjacent wire.

    The same resister at V2 leg 8 to ground looks fine.

    I’m a long time reader, but new member so I will post pics after the 7 days. I am told that this unit was removed from service and shipped. Any insight to the cause or what to look for?
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    Guest
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    New member and proud owner 70A Empty Re: New member and proud owner 70A

    Post by Guest Sat Jan 09, 2016 4:05 pm

    .


    Last edited by PeterCapo on Thu Dec 03, 2020 10:14 pm; edited 1 time in total
    crashb4
    crashb4


    Posts : 13
    Join date : 2016-01-07
    Age : 62
    Location : Monson, Ma.

    New member and proud owner 70A Empty Re: New member and proud owner 70A

    Post by crashb4 Sat Jan 09, 2016 6:28 pm

    Peter,
    Thanks for your reply. I don't want to apply any voltage to a piece of equipment with an obvious fault. I will begin measuring components with special attention to the bias circuit. This is my first tube amp and I don't want to make a mistake in haste. I am aware of the need for safety with the voltages present, but appreciate the reminder.
    Thanks again

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    New member and proud owner 70A Empty Re: New member and proud owner 70A

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