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    PAS3 Power Supply rebuild questions

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    j4570

    Posts : 141
    Join date : 2010-08-30

    PAS3 Power Supply rebuild questions

    Post by j4570 on Tue May 17, 2011 9:11 pm

    No that I've finished the ST70, I'd like to try to fire up the PAS3 (it's not an 3X that I can tell). However, the old quad cap and other caps look like they need to go.

    I believe it's got a 30-20-20-10 quad cap in there-appears original. I've got to read the PAS3 manual and schematic some more, but I didn't see what the value was supposed to be. Dynaco 12AX7's in the preamp too! I suspect the caps are bad.

    What's the options, I've seen a few cap boards, but what do members here do?

    Also, the selenium has to go of course.

    Pics would be great.

    Thanks,

    Jason

    Westy56

    Posts : 58
    Join date : 2011-05-09
    Location : Albuquerque

    Re: PAS3 Power Supply rebuild questions

    Post by Westy56 on Tue May 17, 2011 9:34 pm

    j4570 wrote:No that I've finished the ST70, I'd like to try to fire up the PAS3 (it's not an 3X that I can tell). However, the old quad cap and other caps look like they need to go.

    I believe it's got a 30-20-20-10 quad cap in there-appears original. I've got to read the PAS3 manual and schematic some more, but I didn't see what the value was supposed to be. Dynaco 12AX7's in the preamp too! I suspect the caps are bad.

    What's the options, I've seen a few cap boards, but what do members here do?

    Also, the selenium has to go of course.

    Pics would be great.

    Thanks,

    Jason

    Hey Jason, I'll be watching this to help me on a pas refurb.

    Did you up the quad cap capacitance when you did your 70?


    Steve

    baddog1946

    Posts : 304
    Join date : 2010-02-03
    Location : Costa Rica

    Re: PAS3 Power Supply rebuild questions

    Post by baddog1946 on Tue May 17, 2011 9:46 pm

    Hi:
    Check out this power supply option for the PAS 3. I like the adjustable filament voltage and tunability of it.

    http://home.comcast.net/~netminer/PAS-3.html

    j4570

    Posts : 141
    Join date : 2010-08-30

    Re: PAS3 Power Supply rebuild questions

    Post by j4570 on Wed May 18, 2011 3:09 pm

    Steve,

    Pics of my rebuild on my St70 are posted elsewhere on the forum. The original quad cap was toast. Matter of fact, I reused the chassis, the cage, and the output transformers. The power transformer I probably could have resued if I reinsulated the wires, but I upgraded it too.

    Jason

    j4570

    Posts : 141
    Join date : 2010-08-30

    Re: PAS3 Power Supply rebuild questions

    Post by j4570 on Wed May 18, 2011 3:45 pm

    I should have said I upgraded the quad cap with the CE one from Bob.

    Jason

    j4570

    Posts : 141
    Join date : 2010-08-30

    Re: PAS3 Power Supply rebuild questions

    Post by j4570 on Mon May 23, 2011 8:50 pm

    baddog,

    do you have a pic of that cap board installed?

    Thanks,

    Jason

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