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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


4 posters

    Replacing selenium rectifier on PAM

    bubbasweet
    bubbasweet


    Posts : 95
    Join date : 2016-03-14

    Replacing selenium rectifier on PAM Empty Replacing selenium rectifier on PAM

    Post by bubbasweet Sun Mar 27, 2016 9:55 pm

    I have seen a few posts about this. Is there anyone that has the replacement procedure to Silicon Diodes in a little more depth? I will also replace Caps 1000uF 50V should be good? I have the schematic. Is it just as easy as putting the Silicon Diodes where the Selenium diodes go in the schem? THX
    peterh
    peterh


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    Join date : 2012-12-25
    Location : gothenburg, sweden

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    Post by peterh Mon Mar 28, 2016 2:34 am

    It should be that easy. Mechanically you might need a solder strip.
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    GP49


    Posts : 792
    Join date : 2009-04-30
    Location : East of the sun and west of the moon

    Replacing selenium rectifier on PAM Empty Re: Replacing selenium rectifier on PAM

    Post by GP49 Mon Mar 28, 2016 11:07 pm

    You really could very probably get away with soldering a silicon diode across the old selenium rectifier, using it as a tie-strip.  The silicon is lower resistance so the presence of the selenium rectifier, especially if it has gone high-resistance (that's what happens to nearly all of them when they get old), won't make any electrical difference.
    bubbasweet
    bubbasweet


    Posts : 95
    Join date : 2016-03-14

    Replacing selenium rectifier on PAM Empty Re: Replacing selenium rectifier on PAM

    Post by bubbasweet Tue Mar 29, 2016 1:16 am

    Anyone know if any added resistance is needed as only .7 across a diode? or just the IN4007s. Also do any of you use 2 diodes per side or is one good enough. I suppose I am over thinking.
    Tubes4ever
    Tubes4ever


    Posts : 167
    Join date : 2015-07-14
    Location : Star, Idaho

    Replacing selenium rectifier on PAM Empty Re: Replacing selenium rectifier on PAM

    Post by Tubes4ever Thu Mar 31, 2016 10:19 am

    One diode is enough.

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