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    another VTA ST70 chassis variation

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    MontanaWay

    Posts : 767
    Join date : 2014-02-06
    Age : 58
    Location : Cameron, Montana

    another VTA ST70 chassis variation

    Post by MontanaWay on Sun Sep 07, 2014 5:07 pm

    this is my latest build, a custom VTA ST70 in a Hammond chassis with mini retro look VU meters.
    I kind of stumbled across these VU meters. A true VU meter they are not I guess, they come with their own driver circuit and you can either have a low level signal or high level signal input.
    Low level is preamp level output, no good in this instance as it will interfere  with the amps input.
    So I am using the high level input, straight from the speaker output, hence not a true VU reading. The VU meter driver board comes with two trimpots to adjust the meter deflection and I guess one can get close to a correct reading.
    If you buy these as a kit, they come with a neat little fully encapsulated mini transformer, capable for 115 or 220V mains and with 6,9 & 12V tappings. It is small enough, as is the VU driver pcb, to fit inside the chassis.
    I don't have an inside chassis shot yet, will post one once I get a chance to take a couple.

     photo tboprot1_zps4fcfcbc0.jpg

     photo tboprot2_zpsa683b6ea.jpg

     photo fdrear_zps0e858441.jpg

     photo tboprotin_zpsc3f52b2e.jpg


    Last edited by MontanaWay on Sun Sep 07, 2014 6:15 pm; edited 2 times in total

    Bob Latino
    Admin

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    Join date : 2008-11-26
    Location : Massachusetts

    Re: another VTA ST70 chassis variation

    Post by Bob Latino on Sun Sep 07, 2014 5:19 pm

    Holger,

    Your custom VTA ST-70 amp looks really nice. You did an excellent job on the assembly of the amp .. Yes - post up a shot of the interior wiring when you get the chance ..

    (NOTE - wiring photo posted above on 9/7/14)

    Bob


    Last edited by Bob Latino on Mon Sep 08, 2014 9:07 am; edited 1 time in total

    MontanaWay

    Posts : 767
    Join date : 2014-02-06
    Age : 58
    Location : Cameron, Montana

    Re: another VTA ST70 chassis variation

    Post by MontanaWay on Sun Sep 07, 2014 5:30 pm

    Bob Latino wrote:Holger,

    Your custom VTA ST-70 amp looks really nice. You did an excellent job on the assembly of the amp .. Yes - post up a shot of the interior wiring when you get the chance ..

    Bob

    thanks Bob, appreciate your comment! Smile

    Hoffsgarage

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    Join date : 2014-08-11
    Age : 54
    Location : Pennsylvania

    Re: another VTA ST70 chassis variation

    Post by Hoffsgarage on Sun Sep 07, 2014 5:48 pm

    Amazing. Nice job!

    zx

    Posts : 194
    Join date : 2011-08-05

    Re: another VTA ST70 chassis variation

    Post by zx on Sun Sep 07, 2014 6:00 pm

    Cool look...thanks for the pic.....an how dose it sound?..........have fun with tubes.





    thanks for the site Bob..........

    MontanaWay

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    Location : Cameron, Montana

    Re: another VTA ST70 chassis variation

    Post by MontanaWay on Sun Sep 07, 2014 6:16 pm

    inside view shot added, you can see the mini transformer and VU driver board on the left

    MontanaWay

    Posts : 767
    Join date : 2014-02-06
    Age : 58
    Location : Cameron, Montana

    Re: another VTA ST70 chassis variation

    Post by MontanaWay on Sun Sep 07, 2014 6:42 pm

    zx wrote:Cool look...thanks for the pic.....an how dose it sound?..........have fun with tubes.





    thanks for the site Bob..........

    it sounds like we all expect the VTA ST70 to....really amazing, I am using NOS RCA 5963's as drivers, very nice indeed!
    Right now, I am running it without my preamp, which is waiting for a toroid transformer, the VTA ST70 just sounds amazingly clear and really a good bass as well using the KT88's, which have been running for some months now and sound sweet!

    audiobill

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    Location : Philadelphia

    Re: another VTA ST70 chassis variation

    Post by audiobill on Mon Sep 08, 2014 4:42 am

    Really nice work!

    colin86325

    Posts : 40
    Join date : 2014-04-01

    Re: another VTA ST70 chassis variation

    Post by colin86325 on Mon Sep 08, 2014 10:57 am

    Gorgeous, you should be proud!

    aguaazul

    Posts : 45
    Join date : 2012-07-08
    Location : Livermore, CA

    Re: another VTA ST70 chassis variation

    Post by aguaazul on Tue Sep 09, 2014 6:16 pm

    Good looking work for sure!

    sKiZo

    Posts : 1287
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    Location : Michigan USA

    Re: another VTA ST70 chassis variation

    Post by sKiZo on Tue Sep 09, 2014 9:16 pm

    Very nice ... but then again, you're building what ... about one a week? I figure you should be getting pretty good at it by now ...  jocolor

    And yes ... the 5963's were a pleasant surprise here also. They match up quite nicely with the KT120's ... my tube rolling days may be over.


    *Yeah ... THAT could happen!  lol!

    PS ... colin86325 called you gorgeous ... ;-}


    MontanaWay

    Posts : 767
    Join date : 2014-02-06
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    Re: another VTA ST70 chassis variation

    Post by MontanaWay on Tue Sep 09, 2014 9:27 pm

    sKiZo wrote:Very nice ... but then again, you're building what ... about one a week? I figure you should be getting pretty good at it by now ...  jocolor

    And yes ... the 5963's were a pleasant surprise here also. They match up quite nicely with the KT120's ... my tube rolling days may be over.


    *Yeah ... THAT could happen!  lol!

    PS ... colin86325 called you gorgeous ...  ;-}


    wish I was building one a week!!!!!....then I could maybe retire!

    have not tried the 5963 with the KT120...I use 6SN7 & 6SL7 with the KT120's/ST120......5963 and select 12AU7's with the KT88/ST70

    tubes4hifi
    Admin

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    Re: another VTA ST70 chassis variation

    Post by tubes4hifi on Wed Sep 10, 2014 1:23 pm

    you are retired!! keep on fishing and building an amp a week!!

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