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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


    PAS 3 Problems

    OldFrisco
    OldFrisco

    Posts : 38
    Join date : 2020-02-16
    Location : San Francisco

    PAS 3 Problems - Page 2 Empty Re: PAS 3 Problems

    Post by OldFrisco on Sun Dec 27, 2020 2:49 pm

    Yeah, that's the biggest challenge. I tried some plastic/cloth adhesive last night. I'll see how strong it is this morning. But I've never seen leads that small. I can't even test them with a DMM. They're too fragile.
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    michael.samra

    Posts : 10
    Join date : 2015-05-16
    Age : 62
    Location : michigan

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    Post by michael.samra on Mon Dec 28, 2020 6:19 am

    Frisco
    The challenge is always fun in fixing transformers but I would get that torrid
    for 28 dollars. You are going to drive yourself crazy with that transformer and
    if it was a better made Power transformer it would be worth it but those transformers
    are the weakest link in the PAS series.You have a nice PS board you built and the new transformer would complement that circuit so well. I used 4 of them including one in my PAS3X and I couldn't be happier.
    OldFrisco
    OldFrisco

    Posts : 38
    Join date : 2020-02-16
    Location : San Francisco

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    Post by OldFrisco on Mon Dec 28, 2020 2:43 pm

    I've read some comments suggesting people have had problems with them failing. But for $30, I might be inclined to give one a try. Fixing the original I have is proving to be extremely difficult, and I haven't been able to find any replacements. It seems everyone is sold of the new units. You've had good luck with them?
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    michael.samra

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    Location : michigan

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    Post by michael.samra on Mon Dec 28, 2020 2:49 pm

    Yes
    I've had great luck with them. Being a torroid, it's much more efficient than the EI Core as far as a power transformer goes. I don't like torroids for outputs unless you get some real good ones but this little transformer is perfect and it frees up room to do other mods if you want. You can't go wrong with this transformer.
    OldFrisco
    OldFrisco

    Posts : 38
    Join date : 2020-02-16
    Location : San Francisco

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    Post by OldFrisco on Mon Dec 28, 2020 2:52 pm

    Yeah, even if it fails, it's not that much money. And most of them must be fine, or they wouldn't stay in production. Otherwise, I don't know when I might find one used. My understanding is that the company that was building the new, replacement units for Triode and Dynakit went out of business.
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    michael.samra

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    Location : michigan

    PAS 3 Problems - Page 2 Empty Re: PAS 3 Problems

    Post by michael.samra on Mon Dec 28, 2020 2:57 pm

    Frisco
    This same place also has the EI core transformer. Sometimes when you hear people talk about about failures, they are spinning their wheels thru something they may have heard. Take a look at the other transformers they have. That torrid will work perfectly and I have worked on tube gear for 44 years now.
    http://www.analogmetric.com/category.php?id=185


    Last edited by michael.samra on Mon Dec 28, 2020 3:00 pm; edited 1 time in total
    OldFrisco
    OldFrisco

    Posts : 38
    Join date : 2020-02-16
    Location : San Francisco

    PAS 3 Problems - Page 2 Empty Re: PAS 3 Problems

    Post by OldFrisco on Mon Dec 28, 2020 2:59 pm

    The page is saying the units are not available. Does that make sense to you?
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    michael.samra

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    Location : michigan

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    Post by michael.samra on Mon Dec 28, 2020 3:01 pm

    It's possible. Are you talking about the torroids?
    OldFrisco
    OldFrisco

    Posts : 38
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    Post by OldFrisco on Mon Dec 28, 2020 3:02 pm

    Yeah. When I hit the add to cart button, a dialog box pops up saying it isn't available.
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    stewdan

    Posts : 213
    Join date : 2010-03-07
    Age : 82
    Location : Houston Texas

    PAS 3 Problems - Page 2 Empty Re: PAS 3 Problems

    Post by stewdan on Mon Dec 28, 2020 8:10 pm

    Hi --- Though I would let you know, there is a Pas Transformer up on the E Site for about $10.
    Stew
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    michael.samra

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    Post by michael.samra on Mon Dec 28, 2020 8:14 pm

    I saw that one but the bid is at 10.88 with a couple days to go. He should try for it.
    OldFrisco
    OldFrisco

    Posts : 38
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    Post by OldFrisco on Mon Dec 28, 2020 8:21 pm

    Yeah, I saw that a few days ago. I have it on my watchlist. Otherwise, I'm going to have to go with a Hammond and try to make sure everything specs out. https://www.digikey.com/en/products/detail/hammond-manufacturing/273AZ/454563?s=N4IgTCBcDaIA4EMBOAXABGA7AZgIIC0BaAOQBEQBdAXyA
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    michael.samra

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    Post by michael.samra on Tue Dec 29, 2020 4:23 am

    The one from Digikey is too big. Try Heyboer or Try getting that one on ebay/
    OldFrisco
    OldFrisco

    Posts : 38
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    Post by OldFrisco on Tue Dec 29, 2020 1:09 pm

    I'm definitely waiting to see about the one on eBay. It has a couple days left on it. If that doesn't work out, then I'll get serious about finding a suitable replacement. I haven't really even looked into that yet, at least not any further than seeing about the toroid.
    OldFrisco
    OldFrisco

    Posts : 38
    Join date : 2020-02-16
    Location : San Francisco

    PAS 3 Problems - Page 2 Empty Re: PAS 3 Problems

    Post by OldFrisco on Tue Jan 05, 2021 10:39 pm

    I'm ready to throw the thing in the garbage! I bought the transformer that was listed on eBay. When it arrived, I put it on the bench and verified that it's working properly. I then installed it in the preamp, and same damn thing. Apparently the transformer wasn't the problem. I was never able to test the old one because the lead broke off after I took it out. When I try to power up, it's exactly the same thing. The DBT lights up dimly, so I assume there's a dead short somewhere, but I've checked everything and can't find it. Clearly, I'm out of my ability level here. Does anyone have a diagnostic plan I could try? I've never had a problem like this. Hell, I've never had any problems with my builds. This is a first for me, and I'm stumped and stupid.
    OldFrisco
    OldFrisco

    Posts : 38
    Join date : 2020-02-16
    Location : San Francisco

    PAS 3 Problems - Page 2 Empty Re: PAS 3 Problems

    Post by OldFrisco on Tue Jan 05, 2021 11:13 pm

    I also tried a different rectifier tube.
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    Dale Stevens

    Posts : 162
    Join date : 2014-07-06
    Age : 71
    Location : Loris, SC

    PAS 3 Problems - Page 2 Empty Re: PAS 3 Problems

    Post by Dale Stevens on Sat Jan 09, 2021 8:24 pm

    Frisco, keep this bumped up, as i'm certain some on here can help; Maybe everyone is just busy.
    Do you have a good test meter with capacitance function ? and ESR meter? seems the PAS has a near short on the board where the new PT inputs. Don't trash it (we'll take it) Dale

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