The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Dynaco VTA tube amp kits, all Tubes4hifi.com products and all Dynakitparts.com products


    Dynaco Mark II, Mark III driver board parts layout - photo ...

    Share
    Bob Latino

    Bob Latino
    Admin

    Posts: 1544
    Join date: 2008-11-26
    Location: Massachusetts
    • Post n°1

    Dynaco Mark II, Mark III driver board parts layout - photo ...

    Post by Bob Latino on Wed Nov 11, 2009 9:34 am

    As with the ST-70, Dynaco never listed what parts were on the PC-1 driver board of the Mark III (or the Mark II for that matter which uses the same driver board.) The photo below is of a replacement driver board for the Mark III which shows the location of all components on the stock PC-1 driver board.

    Bob

    • Back to top
    tubes4hifi

    tubes4hifi
    Admin

    Posts: 738
    Join date: 2008-11-30
    • Post n°2

    Re: Dynaco Mark II, Mark III driver board parts layout - photo ...

    Post by tubes4hifi on Sat Dec 05, 2009 1:49 am

    another note here, some OLDER versions of the MK2 used the identical circuit and layout but a larger size PCB that is nearly square
    • Back to top
    scsidude2

    scsidude2

    Posts: 25
    Join date: 2010-03-19
    Age: 26
    Location: Dekalb, IL
    • Post n°3

    Re: Dynaco Mark II, Mark III driver board parts layout - photo ...

    Post by scsidude2 on Tue Jul 13, 2010 9:37 am

    Which resistors are rated for 1 Watt? Thanks -Ryan
    • Back to top
    Bob Latino

    Bob Latino
    Admin

    Posts: 1544
    Join date: 2008-11-26
    Location: Massachusetts
    • Post n°4

    Re: Dynaco Mark II, Mark III driver board parts layout - photo ...

    Post by Bob Latino on Tue Jul 13, 2010 10:18 am

    scsidude2 wrote:Which resistors are rated for 1 Watt? Thanks -Ryan


    Ryan,

    I believe they are all 1/2 watt except for the 1000 ohm and the two 47K resistors which are probably 1 watt. Notice the slightly wider spacing on the 1000 ohm and the two 47K resistors. This wider spacing is what leads me to believe that they should probably be 1 watt. Again, Dynaco never listed in the assembly manual the parts on the board. When you were building your Mark II or Mark III kit, the board came pre-assembled.

    Bob
    • Back to top
    DynakitParts

    DynakitParts
    Admin

    Posts: 98
    Join date: 2008-11-30
    • Post n°5

    Dynaco PC-1

    Post by DynakitParts on Tue Jul 13, 2010 12:35 pm


    Hi Guys,
    Bob is correct..The two (2) 47K and the
    one (1) 1K resistors are 1 watt. Also, the 47K
    resistor pair and the 100K 1/2 watt resistor pair
    should be 1% matched. All remaing resistors are
    1/2 watt.

    Another note regards the 390 pF and 12 pF caps..
    Both of these were rated at 1000 volts.

    Kevin
    • Back to top
    hawaii.ken

    hawaii.ken

    Posts: 121
    Join date: 2012-01-31
    • Post n°6

    Re: Dynaco Mark II, Mark III driver board parts layout - photo ...

    Post by hawaii.ken on Tue Mar 05, 2013 6:07 pm

    Can anyone tell me who made those black PC boards?

    ========

    Never mind, I see them on fleaBay
    • Back to top
    « View previous topic · View next topic »

      Current date/time is Thu Jun 20, 2013 2:28 am