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    The little known Dynaco PAS-3 Series II - photo

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    Bob Latino

    Bob Latino
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    • Post n°1

    The little known Dynaco PAS-3 Series II - photo

    Post by Bob Latino on Tue Jun 08, 2010 1:27 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

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    Corona

    Corona

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    Join date: 2010-03-11
    • Post n°2

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

    Post by Corona on Tue Jun 08, 2010 11:40 pm

    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.
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    Sal

    Sal

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    Location: Central New Jersey Dynaco-ST70.com
    • Post n°3

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

    Post by Sal on Wed Jun 09, 2010 9:54 am

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

    Sal
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    GP49

    GP49

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    • Post n°4

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

    Post by GP49 on Wed Jun 09, 2010 11:01 am

    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.
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    Bob Latino

    Bob Latino
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    • Post n°5

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

    Post by Bob Latino on Wed Jun 09, 2010 11:22 am

    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

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    GP49

    GP49

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    • Post n°6

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

    Post by GP49 on Wed Jun 09, 2010 5:00 pm

    Cathode followers, they are!
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