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    The little known Dynaco PAS-3 Series II - photo

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    Bob Latino
    Admin

    Posts: 1996
    Join date: 2008-11-26
    Location: Massachusetts

    The little known Dynaco PAS-3 Series II - photo

    Post by Bob Latino on Tue Jun 08, 2010 2:27 pm

    Many know about the older Dynaco PAS-2 and PAS-3 preamps and the more modern mid '90's Dynaco PAS-4 built by Panor. There was, however, a transitional model built in the early '90's also by Panor > the PAS-3 Series II. The circuits of all three preamps were different. The tube line-up for each preamp was ...

    PAS-2 and PAS-3 > four 12AX7 tubes
    PAS-3 Series II > six 12AX7 tubes
    PAS-4 > two 12AX7 (phono section) and four 6DJ8 (6922) (line section) tubes

    PAS-3 Series II composite photo below

    Bob



    Corona

    Posts: 32
    Join date: 2010-03-11

    Re: The little known Dynaco PAS-3 Series II - photo

    Post by Corona on Wed Jun 09, 2010 12:40 am

    Interesting...
    I wonder if all 6 12ax7's are really necessary or if they just added extra tubes for the look like some chinese amps on ebay.

    Sal

    Posts: 222
    Join date: 2009-02-05
    Location: Central New Jersey Dynaco-ST70.com

    Re: The little known Dynaco PAS-3 Series II - photo

    Post by Sal on Wed Jun 09, 2010 10:54 am

    Probably 4 12AX7's for the phono stage and 2 for the line stage.

    Sal

    GP49

    Posts: 511
    Join date: 2009-04-30

    Re: The little known Dynaco PAS-3 Series II - photo

    Post by GP49 on Wed Jun 09, 2010 12:01 pm

    Or...and this would have been a worthwhile addition if done properly...a cathode follower for both channels of the phono stage and the linestage, to make the circuitry almost unaffected by the input impedance of whatever is connected to the preamp.

    Bob Latino
    Admin

    Posts: 1996
    Join date: 2008-11-26
    Location: Massachusetts

    Re: The little known Dynaco PAS-3 Series II - photo

    Post by Bob Latino on Wed Jun 09, 2010 12:22 pm

    Below is the PAS-3 Series II schematic less the power supply. You can judge for yourself how the three 12AX7's per channel were worked into the circuit.

    Bob



    GP49

    Posts: 511
    Join date: 2009-04-30

    Re: The little known Dynaco PAS-3 Series II - photo

    Post by GP49 on Wed Jun 09, 2010 6:00 pm

    Cathode followers, they are!

    dyna1

    Posts: 2
    Join date: 2013-12-26

    Re: The little known Dynaco PAS-3 Series II - photo

    Post by dyna1 on Fri Dec 27, 2013 2:49 pm

    Hi, Bob, thank-you for the link, but I believe I cannot see the values of the 3 caps. Would you happen to know someone that may have the complete schematics.

    Regards Sandro

    Bob Latino
    Admin

    Posts: 1996
    Join date: 2008-11-26
    Location: Massachusetts

    Re: The little known Dynaco PAS-3 Series II - photo

    Post by Bob Latino on Fri Dec 27, 2013 3:38 pm

    Email sent ... That is the only schematic that I have and it does not show the power supply caps. Also - In the manual - there is no schematic. I do not know the value of those three caps.

    Bob

    dyna1

    Posts: 2
    Join date: 2013-12-26

    Re: The little known Dynaco PAS-3 Series II - photo

    Post by dyna1 on Fri Dec 27, 2013 4:30 pm

    Thank-you for your time, if ever happen to find out I would love to have these values. Are able to post a request on your site. Thank-you again for all your help and time.

    Best Regards
    Sandro

    fedoragent

    Posts: 27
    Join date: 2013-09-14

    Re: The little known Dynaco PAS-3 Series II - photo

    Post by fedoragent on Sat Dec 28, 2013 1:37 pm

    Thanks Bob, that was great to see. How long were they sold? Were they a limited production?

    Thanks,

    Jon

    DynakitParts
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    PAS Series II

    Post by DynakitParts on Sat Dec 28, 2013 1:56 pm

    Hi,
    There were two versions offered...One with the Chrome faceplate & knobs (like the photo above)
    and the other with a Black faceplate & knobs. Both were designed & sold through Sound Values in Ohio...Jon & Joy Petterson I believe were the owners. I suspect that not many of these units were produced...I would guess a few hundred at best.


    Some time later Panor Corp. began making their own version of this PAS. I actually have a few of the "Sound Values" PAS Series II NOS power transformers on the shelf.....PC mounted style.

    Kevin


    DarthBubba

    Posts: 76
    Join date: 2012-05-05

    Re: The little known Dynaco PAS-3 Series II - photo

    Post by DarthBubba on Sat Dec 28, 2013 6:38 pm

    Bob Latino wrote:Below is the PAS-3 Series II schematic less the power supply. You can judge for yourself how the three 12AX7's per channel were worked into the circuit.

    Oh my goodness, both stereo channels in each tube envelope!

    GP49

    Posts: 511
    Join date: 2009-04-30

    Re: The little known Dynaco PAS-3 Series II - photo

    Post by GP49 on Sun Dec 29, 2013 12:15 pm

    Nobody ever said Panor was the brightest bulb in the box. They bought "Dynaco" for the name, but did not have the engineering prowess to match the reputation.

    StereoGaryo

    Posts: 12
    Join date: 2010-11-06
    Location: SoCal

    Re: The little known Dynaco PAS-3 Series II - photo

    Post by StereoGaryo on Tue Dec 31, 2013 7:42 pm

    The PAS-4 has four tubes in the phono section: Two 12AX7's and a pair of 6922's. The line stage has the remaining pair of 6922's.

    StereoGaryo

    Posts: 12
    Join date: 2010-11-06
    Location: SoCal

    Re: The little known Dynaco PAS-3 Series II - photo

    Post by StereoGaryo on Tue Dec 31, 2013 7:46 pm

    GP49 wrote:Nobody ever said Panor was the brightest bulb in the box.  They bought "Dynaco" for the name, but did not have the engineering prowess to match the reputation.

    The PAS-4 was the exception regarding a well engineered, Panor unit. It was designed by John Nunes of MFA fame.

      Current date/time is Sat Dec 20, 2014 11:13 pm