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    What if........Mark III

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    Greg_M

    Posts : 40
    Join date : 2010-09-18
    Location : Poulsbo, WA

    What if........Mark III

    Post by Greg_M on Thu Sep 23, 2010 10:45 am

    If you wanted to make an amplifier like the ST70 but with MK III components (60w per ch). Would the Mk III input transformer be powerful enough to handle both channels, or would you need a different input transformer?

    Just wondering

    avi.inc

    Posts : 53
    Join date : 2009-08-03
    Age : 63
    Location : L.A.

    What if....

    Post by avi.inc on Thu Sep 23, 2010 11:18 am

    Well i think you would need a bigger Transformer or you could just make a st-120.

    http://www.tubes4hifi.com/bob.htm

    Bob Latino
    Admin

    Posts : 2378
    Join date : 2008-11-26
    Location : Massachusetts

    Re: What if........Mark III

    Post by Bob Latino on Thu Sep 23, 2010 11:50 am

    Greg_M wrote:If you wanted to make an amplifier like the ST70 but with MK III components (60w per ch). Would the Mk III input transformer be powerful enough to handle both channels, or would you need a different input transformer?

    Just wondering

    Hi Greg,

    The ST-120 tube amp kit is basically equivalent to two Dynaco Mark III's with a VTA driver board on a single chassis.

    1. It has the convenience of a single chassis
    2. It is less costly than purchasing two Dynaco Mark III kits

    You mentioned "input transformer" but I think you mean power transformer. The power transformer on the ST-120 is custom wound and has thicker gauge wire than the Mark III power transformer so that it may drive TWO channels instead of just one channel like on a Mark III. It also has higher voltage windings than an ST-70 power transformer and a higher stack lamination than the ST-70 power transformer. The chassis on the ST-120 has 4 extra holes drilled for the ST-120's output transformers because they are 1/4 inch wider than the ST-70's output transformers.

    Bob


    Last edited by Bob Latino on Sat Sep 25, 2010 7:09 pm; edited 1 time in total

    Greg_M

    Posts : 40
    Join date : 2010-09-18
    Location : Poulsbo, WA

    Re: What if........Mark III

    Post by Greg_M on Thu Sep 23, 2010 12:03 pm

    Bob Latino wrote:
    Greg_M wrote:If you wanted to make an amplifier like the ST70 but with MK III components (60w per ch). Would the Mk III input transformer be powerful enough to handle both channels, or would you need a different input transformer?

    Just wondering

    Hi Greg,

    The ST-120 tube amp kit is basically equivalent to two Dynaco Mark III's with a VTA driver board on a single chassis.

    1. It has the convenience of a single chassis
    2. It is less costly than purchasing two Dynaco Mark III kits

    You mentioned "input transformer" but I think you mean power transformer. The power transformer on the ST-120 is custom wound and has thicker gauge wire than the Mark III power transformer so that it may drive TWO channels instead of just one channel like on a Mark III. It also has higher voltage windings than an ST-70 power transformer and a higher stack lamination than the ST-70 power transformer. The chassis on the ST-120 has 4 extra holes drilled for the output transformers because they are 1/4 inch wider than the ST-70's output transformers.

    Bob


    Yes I did mean power transformer
    Thanks

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