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    Replacing selenium rectifier on PAM

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    bubbasweet

    Posts : 53
    Join date : 2016-03-14

    Replacing selenium rectifier on PAM

    Post by bubbasweet on 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

    Posts : 679
    Join date : 2012-12-25
    Location : gothenburg, sweden

    Re: Replacing selenium rectifier on PAM

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

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

    GP49

    Posts : 733
    Join date : 2009-04-30
    Location : East of the sun and west of the moon

    Re: Replacing selenium rectifier on PAM

    Post by GP49 on 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

    Posts : 53
    Join date : 2016-03-14

    Re: Replacing selenium rectifier on PAM

    Post by bubbasweet on 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

    Posts : 61
    Join date : 2015-07-14
    Location : Star, Idaho

    Re: Replacing selenium rectifier on PAM

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

    One diode is enough.

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