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The Dynaco Tube Audio Forum

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


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corndog71
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    M-125 volume problem - fixed !

    Bob Latino
    Bob Latino
    Admin


    Posts : 3101
    Join date : 2008-11-26
    Location : Massachusetts

    M-125 volume problem - fixed ! - Page 2 Empty Re: M-125 volume problem - fixed !

    Post by Bob Latino Mon Nov 15, 2021 1:41 pm

    Note to Tubes4HiFi: The M-125 could easily be mirrored, just bend half the chassis the other way.
    Novice builders should build the Left [power tubes left] amp to familiarize and then do the Right.
    [/quote]

    Two things with that statement ..

    1. It costs LESS to have 50 chassis made up of one type than it does to have 25 LEFT and 25 RIGHT chassis made up. You would add about $20 to the cost of each chassis. Since you have TWO chassis, a pair of M-125's would cost about $40 more. To "just bend the chassis the other way" would also add to the set up time and increase the cost of the amp.

    2. The assembly manual is written for just one type of chassis and does contain references to the "left of" and the "right of" which would only pertain to a single type of chassis. This could confuse the builder.

    The VTA amps are high quality "do it yourself" type amps that give great sound at a reasonable price. Having mirror image chassis would contribute nothing to the sound of the amps. It would only add to the price and could could cause confusion during the build of the amps. The Dynaco Mark III and Mark IV monoblock amps did not have left and right handed chassis and I never heard anyone complain about them ?

    Bob
    corndog71
    corndog71


    Posts : 807
    Join date : 2013-03-19
    Location : It can get windy here

    M-125 volume problem - fixed ! - Page 2 Empty Re: M-125 volume problem - fixed !

    Post by corndog71 Mon Nov 15, 2021 9:30 pm

    Having built custom monoblock amps with mirrored chassis, I can say it’s not as simple as it looks. You’d be surprised how much it messes with your brain trying to “flip” a circuit.

    Bob Latino likes this post

    Bob Latino
    Bob Latino
    Admin


    Posts : 3101
    Join date : 2008-11-26
    Location : Massachusetts

    M-125 volume problem - fixed ! - Page 2 Empty Re: M-125 volume problem - fixed !

    Post by Bob Latino Mon Nov 15, 2021 9:42 pm

    corndog71 wrote:Having built custom monoblock amps with mirrored chassis, I can say it’s not as simple as it looks.  You’d be surprised how much it messes with your brain trying to “flip” a circuit.

    Quite true !

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    M-125 volume problem - fixed ! - Page 2 Empty Re: M-125 volume problem - fixed !

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