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    VTA ST - 120 Driver tube choices

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    Analog Man

    Posts : 56
    Join date : 2013-09-01
    Age : 54
    Location : St. Louis, MO - On The Hill

    VTA ST - 120 Driver tube choices

    Post by Analog Man on Sat Sep 21, 2013 9:02 pm

    I've been doing a little tube rolling with the driver tubes and I think I found the perfect combination if you are into full range music.
    In the center, try a N.O.S. JAN 5814A and on the sides try JJ ECC 802S.
    This is the most musical full range combo I have found. Music chosen was Jethro Tull's Thick as a brick.
    What have you all found with your experimentation?
    I would really appreciate any ones input on this. I know this is subjective and personal preferences differ.
    I am playing through my Cerwin Vega VE - 15 speakers. I will soon try my Polk Audio Rti - 12's.

    Bob Latino
    Admin

    Posts : 2377
    Join date : 2008-11-26
    Location : Massachusetts

    Re: VTA ST - 120 Driver tube choices

    Post by Bob Latino on Sat Sep 21, 2013 9:33 pm

    Check out this forum post by Andy from New Jersey on his experiments with tube rolling in a VTA ST-120 ..

    Rolling driver tubes in the VTA ST-120

    Bob

    Analog Man

    Posts : 56
    Join date : 2013-09-01
    Age : 54
    Location : St. Louis, MO - On The Hill

    Re: VTA ST - 120 Driver tube choices

    Post by Analog Man on Sat Sep 21, 2013 9:42 pm

    Bob Latino wrote:Check out this forum post by Andy from New Jersey on his experiments with tube rolling in a VTA ST-120 ..

    Rolling driver tubes in the VTA ST-120

    Bob
    Thanks again for your wealth of knowledge. I did not see the combo I have tried. Maybe some of you out there will try? I am still listening to Jethro Tull's Thick as a brick and I am in sonic ecstasy!
    Almost as good as sex. A little wine helps as well.

    arledgsc

    Posts : 330
    Join date : 2012-11-30
    Location : SF Bay CA

    Re: VTA ST - 120 Driver tube choices

    Post by arledgsc on Sun Sep 22, 2013 11:02 am

    The ST-120 have proven to be a very revealing amp and like said it responds tube exchanges.  In the end it comes down to personal preference.  I like some top end air and sparkle but can be too much with the right mix of tubes.  Others like a more classic tube sound with tubby bass and rolled off highs.  So some recommendations may not work out for your setup so trust your ears.

    Put some hours on the amp before you do some serious tube rolling.  Also let those new tubes run for a while as the sound can change in the first 50 - 100 hours.   The center tube has the most dramatic affect but I find the phase inverters and output tubes make a sonic difference as well.  So the perfect center tube has to be complimented by the phase inverters and power tubes.  Tube rolling has though been a fun but expensive hobby!  drunken

    Analog Man

    Posts : 56
    Join date : 2013-09-01
    Age : 54
    Location : St. Louis, MO - On The Hill

    Re: VTA ST - 120 Driver tube choices

    Post by Analog Man on Sun Sep 22, 2013 11:22 am

    arledgsc wrote:The ST-120 have proven to be a very revealing amp and like said it responds tube exchanges.  In the end it comes down to personal preference.  I like some top end air and sparkle but can be too much with the right mix of tubes.  Others like a more classic tube sound with tubby bass and rolled off highs.  So some recommendations may not work out for your setup so trust your ears.

    Put some hours on the amp before you do some serious tube rolling.  Also let those new tubes run for a while as the sound can change in the first 50 - 100 hours.   The center tube has the most dramatic affect but I find the phase inverters and output tubes make a sonic difference as well.  So the perfect center tube has to be complimented by the phase inverters and power tubes.  Tube rolling has though been a fun but expensive hobby!  drunken
    $$$ Yes I know! Check these baby's out.
    http://www.tubedepot.com/eat-kt88-quad.html

    Maintarget

    Posts : 208
    Join date : 2013-02-10

    Re: VTA ST - 120 Driver tube choices

    Post by Maintarget on Sun Sep 22, 2013 4:11 pm

    $450.00 a tube when not on sale Ouch!
    Those better be some nice tubes........

    kevinmi

    Posts : 54
    Join date : 2009-11-17

    Re: VTA ST - 120 Driver tube choices

    Post by kevinmi on Sun Sep 22, 2013 5:42 pm

    I'm running some vintage RCA clear tops with good results

    guentherj2

    Posts : 47
    Join date : 2013-06-22
    Location : Bellingham, WA

    Re: VTA ST - 120 Driver tube choices

    Post by guentherj2 on Thu Sep 26, 2013 9:14 pm

    I currently have two NOS Tung Sol 12BH7As and a NOS Sylvania 12AU7A in the center in my ST120. I'm very pleased with this sound. My speakers are B&W CM10s.

    Switching gears - I'm curious how much difference the tubes in the preamp (the VTA SP-12 in my case) vs. the amp makes??? Also - how important it is, or not, to match pairs in the preamp???

    Regards,

    John

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