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    M-65 Mono Blocks

    TMadden
    TMadden

    Posts : 99
    Join date : 2011-12-22

    M-65 Mono Blocks Empty M-65 Mono Blocks

    Post by TMadden on Thu Nov 20, 2014 5:21 pm

    Hey Everybody,

    I wanted to share my latest amp project, the VTA M-65 mono blocks. I really like the sound of the ST-120, but I wanted to add a little twist of my own, so I decided to duplicate the ST-120 but in mono-block form. Luckily Roy has just introduced the MK 3 driver board which is identical to the ST-70-120 driver board but for mono amps, and about the same time a set of used M-125 chassis became available. So, I ordered the ST-120 transformers from Bob and got to work! The sound is the same as I love about the ST-120's, very open and transparent, and they are able to reproduce a 1KHz square wave perfectly, no tilt, ringing or overshoot, just like the ST-120. The power supplies are now of course hardly loaded, which can't hurt the sound either. They sound awesome in my home theater system!

    M-65 Mono Blocks IMG_3749_zps6cebae32

    M-65 Mono Blocks IMG_3751_zps1c14d7ec

    M-65 Mono Blocks IMG_3754_zps74560e26


    Last edited by TMadden on Thu Nov 20, 2014 5:35 pm; edited 1 time in total (Reason for editing : typo)
    Bob Latino
    Bob Latino
    Admin

    Posts : 2807
    Join date : 2008-11-26
    Location : Massachusetts

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    Post by Bob Latino on Thu Nov 20, 2014 5:32 pm

    Nice work Troy .. Just a minor correction. You are using the VTA M-125 POWER transformers but with the VTA ST-120 OUTPUT transformers. Sort of like the Dynaco Mark IV's monoblocks that each used one Dynaco ST-70 A-470 output transformer.

    Bob
    TMadden
    TMadden

    Posts : 99
    Join date : 2011-12-22

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    Post by TMadden on Thu Nov 20, 2014 5:35 pm

    Yes, I just saw my typo, I'll correct that, thanks Bob!
    sKiZo
    sKiZo

    Posts : 1532
    Join date : 2013-04-01
    Location : Michigan USA

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    Post by sKiZo on Thu Nov 20, 2014 5:41 pm

    Be interested in hearing whether isolating the PTs had any effect on separation and sound stage ...

    (Is the flipper in front of the output transformer for P/T switching?)

    Nice work ... maybe Bob & Co will name it after you when they go into production ... clown
    TMadden
    TMadden

    Posts : 99
    Join date : 2011-12-22

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    Post by TMadden on Thu Nov 20, 2014 6:26 pm

    Sure, the separate power supplies should eliminate any cross-talk, and it gives the rectifier tubes a break too!
    The sound-stage is immersive and very realistic, I'm pretty happy with the results!
    The switch was the triode/ pentode switch, I'm not using it, I generally prefer pentode mode.
    deepee99
    deepee99

    Posts : 2231
    Join date : 2012-05-23
    Location : Wallace, Idaho

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    Post by deepee99 on Sat Nov 22, 2014 2:41 pm

    sKiZo wrote:
    Nice work ... maybe Bob & Co will name it after you when they go into production ... clown

    How 'bout, "Far from the Madd(en)ing Crowd." lol!

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