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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


5 posters

    My new baby monoblocks!

    corndog71
    corndog71


    Posts : 840
    Join date : 2013-03-19
    Location : It can get windy here

    My new baby monoblocks! Empty My new baby monoblocks!

    Post by corndog71 Sun Jan 15, 2017 9:55 pm

    I hate to toot my own horn too much but I just can't contain how amazing these turned out!  I had posted before about the new Clarity Caps CSA Series I tried but I also tried several new things at once so I can't really nail down what made the difference.  The other upgrades were Vampire Copper RCA's, Mueller Copper binding posts, Neutrik PowerCon AC connectors, and Vishay Z-Foil resistors at the input.  While they sounded good at the start I've been playing pink noise through them for a few hours every night for the last few nights to kinda help break in the caps.  Last night I sat down to listen to them and my jaw hit the floor!  My speakers vanished and I was hearing a level of clarity I have never achieved before.  At least from an amplifier.  These are essentially single channel versions of the ST35 but also including Dave Gillespie's EFB circuit.  I've already decided to upgrade similar parts in my SP13 and ST120.  All I know is that these things sound better than they have any right to for around $500 in parts!

    My new baby monoblocks! F7784A41-CBDD-4718-9CDB-1A60E755D871_zpsnkh3qcqs

    My new baby monoblocks! 93967AD3-47A6-4122-AA22-C660D0F27ED5_zpsfltzrhyp

    My new baby monoblocks! 2C058A37-86E6-4496-B3FE-A6BD06903F1D_zpsho5tenoo

    My new baby monoblocks! 39FFDC78-E036-4540-83E5-8C6B53658D19_zps9mbv38ez[/quote]

    My new baby monoblocks! 95673627-6229-4441-9E83-31377053121E_zpsbwo2rxpt



    Last edited by corndog71 on Thu Jan 26, 2017 11:18 pm; edited 2 times in total
    Peter W.
    Peter W.


    Posts : 1351
    Join date : 2016-08-07
    Location : Melrose Park, PA

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    Post by Peter W. Thu Jan 26, 2017 4:29 pm

    Impressive.... !
    arledgsc
    arledgsc


    Posts : 503
    Join date : 2012-11-30

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    Post by arledgsc Thu Jan 26, 2017 6:42 pm

    Nice... Even a mirror build with the pair.  I have an EL84 guitar amp and it is the sweetest thing to behold tone wise.  Can you share a schematic?
    corndog71
    corndog71


    Posts : 840
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    Post by corndog71 Fri Jan 27, 2017 1:08 am

    arledgsc wrote:Nice... Even a mirror build with the pair.  I have an EL84 guitar amp and it is the sweetest thing to behold tone wise.  Can you share a schematic?

    Yeah, the mirrored layout made for some interesting learning experiences.

    Check out Dave's lab for more on the EFB circuit which is a better bias arrangement than the original. His paper focuses on the SCA35 but you can find plans for the ST35 version with the pcbs he sells.

    http://www.tronola.com/html/dave_s_lab.html

    I also used an adjustable feedback circuit that I got from Shannon Parks.

    arledgsc
    arledgsc


    Posts : 503
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    Post by arledgsc Fri Jan 27, 2017 5:36 pm

    Awesome!  Thanks...
    bluemeanies
    bluemeanies


    Posts : 274
    Join date : 2015-02-09
    Age : 74
    Location : Folsom Pa.

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    Post by bluemeanies Sat Jan 28, 2017 3:37 pm

    Nice job....what kind of cables are you using?
    deepee99
    deepee99


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

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    Post by deepee99 Sat Jan 28, 2017 3:52 pm

    Sweet!
    corndog71
    corndog71


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    Post by corndog71 Sun Jan 29, 2017 1:06 am

    bluemeanies wrote:Nice job....what kind of cables are you using?

    The cables you see all Kimber Kable although modified. The interconnects are essentially the same as the PBJ but I braided them myself with the newer clear Teflon TCSS wire and used cheaper RCA plugs. Speaker cables are the older black and blue 8TC but with the braid spread open and filled with a bunch of used dryer sheets. It was an experiment I tried inspired by Kimber's ultra expensive Select cables. Not sure if it made much of a difference but it was fun trying.

    I normally use a newer pair of 4TC for speaker cables and braided all of my interconnects with a cotton insulated copper wire by Homegrownaudio.

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