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


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    Maintarget

    Posts : 209
    Join date : 2013-02-10

    New Member

    Post by Maintarget on Sun Feb 17, 2013 7:46 pm

    After much on line research I have narrowed my choice of entry into the world of dyi tube amps to the ST-120 kit.
    The quality of the kit parts, options and instruction appear to be first rate thanks to Roy and Bob's commitment to quality at a fair price.
    My only reservation is cosmetic in nature I just don't care for the location of the inputs, on/off switch and the sockets to set bias, my plan would be to build a larger custom enclosure of aluminum and relocate the on/off switch to the front and the inputs to the rear of the amp and use the M-125 style of pin sockets for biasing located on top near the driver board.
    I would also clean up the top of the enclosure by mounting the driver board on stand offs so only the tubes are protruding out the top, the basic layout of all other components would closely follow the original layout.
    My question is can this be done without degrading sound quality with careful wire routing/shielding?
    Any suggestions or comments would be greatly appreciated.
    Thanks

    Bob Latino
    Admin

    Posts : 2411
    Join date : 2008-11-26
    Location : Massachusetts

    Re: New Member

    Post by Bob Latino on Sun Feb 17, 2013 8:36 pm

    Hi,

    We have had a few people build VTA amp kits on a custom chassis that they designed themselves. About the only two things you have to worry about are ..

    1. If you are going to place the power switch on the FRONT of the amp, twist the AC wiring from the power transformer and run it around one side of the chassis. IOW keep the AC wiring away from the driver circuit.

    2. If you are going to place the input jacks on the rear of the amp either use shielded cable to run the wires to the driver board input eyelets near the front of the amp OR twist both pairs of input wires together and run them around the side of the chassis that is opposite of your AC power wires as mentioned in #1 above.

    Bob

    Maintarget

    Posts : 209
    Join date : 2013-02-10

    Re: New Member

    Post by Maintarget on Mon Feb 18, 2013 2:08 pm

    Thank you Bob, Ill be sending you a e mail with my order soon.

    tubes4hifi
    Admin

    Posts : 1286
    Join date : 2008-11-30

    Re: New Member

    Post by tubes4hifi on Mon Feb 18, 2013 4:11 pm

    have built dozens of amps in that fashion, see 3 examples of photos below:




    denny9167

    Posts : 152
    Join date : 2011-05-09
    Age : 49
    Location : Texas

    Re: New Member

    Post by denny9167 on Mon Feb 18, 2013 4:21 pm

    I have below an example of a pair of Mark IV's that
    I built using my own design. I'm thinking on building a pair of Mark IIi's
    Using the same layout. Which is good all the way around
    I'm the same layout would work for a 120.


    Maintarget

    Posts : 209
    Join date : 2013-02-10

    Re: New Member

    Post by Maintarget on Mon Feb 18, 2013 4:37 pm

    Beautiful work gentelmen!
    These examples are more in line with my personal taste and the look I would like my amp to have, something about the combination of wood, aluminum and color/paint when done right that is pleasing to the eye.
    I have sent my request to Bob now the hard part tempering my excitment until I actual recieve my kit....
    Thanks

    denny9167

    Posts : 152
    Join date : 2011-05-09
    Age : 49
    Location : Texas

    Re: New Member

    Post by denny9167 on Mon Feb 18, 2013 6:38 pm

    I am also using Sketchup 8 and Povray to help me in the design of my amps. Would love to help any way I am able to.

    [img][/img]

    jjones3318

    Posts : 57
    Join date : 2011-04-05
    Location : Boulder, CO

    Re: New Member

    Post by jjones3318 on Mon Feb 18, 2013 10:33 pm

    Here are a pair of custom M125's.


    denny9167

    Posts : 152
    Join date : 2011-05-09
    Age : 49
    Location : Texas

    Re: New Member

    Post by denny9167 on Tue Feb 19, 2013 7:52 am

    jjones3318 wrote:Here are a pair of custom M125's.


    Nice!!

    Sprags

    Posts : 123
    Join date : 2013-02-27

    Re: New Member

    Post by Sprags on Wed Mar 13, 2013 1:27 am

    Those are nice looking M125s.

    terry37932

    Posts : 22
    Join date : 2011-05-18
    Location : Knoxville

    Re: New Member

    Post by terry37932 on Thu Mar 14, 2013 12:43 pm

    [quote="denny9167"]
    jjones3318 wrote:Here are a pair of custom M125's.


    Nice!![/]

    I Think I'm in love!

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