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    VTA amplifier gain

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    audiobill

    Posts : 271
    Join date : 2014-03-13
    Location : Philadelphia

    VTA amplifier gain

    Post by audiobill on Wed Aug 20, 2014 6:15 am

    I'm currently enjoying my M-125's very much through my Dynaudio Gemini speakers, and am thinking about biamping.

    I use my M-125's in triode mode with two (rather than four) output tubes running.

    I could go with another pair of M-125s, of course, or look at the VTA-120 or VTA-70 for biamping the tweeters.

    Questions -

    Are the gain structures of these choices identical?

    Can either be run in triode mode, like my M-125s?

    Can the VTA-120 run KT-120s?

    I know some of the answers are in the specs, but wanted to get them all in one place.

    Many thanks,

    Bill

    Bob Latino
    Admin

    Posts : 2378
    Join date : 2008-11-26
    Location : Massachusetts

    Re: VTA amplifier gain

    Post by Bob Latino on Wed Aug 20, 2014 1:02 pm

    audiobill wrote:I'm currently enjoying my M-125's very much through my Dynaudio Gemini speakers, and am thinking about biamping.

    I use my M-125's in triode mode with two (rather than four) output tubes running.

    I could go with another pair of M-125s, of course, or look at the VTA-120 or VTA-70 for biamping the tweeters.

    Questions -

    Are the gain structures of these choices identical?

    Can either be run in triode mode, like my M-125s?

    Can the VTA-120 run KT-120s?

    I know some of the answers are in the specs, but wanted to get them all in one place.

    Many thanks,

    Bill

    Hi Bill,

    1. The gain structure of the VTA M-125's and the ST-120 is virtually identical (about 1 to 1.1 volt IN for the rated output OUT)

    2. BOTH the VTA M-125 and the VTA ST-120 may be run in triode mode

    3. BOTH the VTA M-125 and the VTA ST-120 may use the Tung-Sol KT120 output tubes

    Bob

    audiobill

    Posts : 271
    Join date : 2014-03-13
    Location : Philadelphia

    Re: VTA amplifier gain

    Post by audiobill on Wed Aug 20, 2014 1:06 pm

    Thanks, Bob.

    I guess the M125 may be overkill for driving the tweeters, especially since I'm running them with two tubes each. Four of them would look cool, though. Wink

    audiobill

    Posts : 271
    Join date : 2014-03-13
    Location : Philadelphia

    Re: VTA amplifier gain

    Post by audiobill on Wed Aug 20, 2014 1:13 pm

    One other question...what are the ST 120 chassis dimensions?

    Thanks,

    Bob Latino
    Admin

    Posts : 2378
    Join date : 2008-11-26
    Location : Massachusetts

    Re: VTA amplifier gain

    Post by Bob Latino on Wed Aug 20, 2014 1:42 pm

    audiobill wrote:One other question...what are the ST 120 chassis dimensions?

    Thanks,

    Bill,

    The VTA ST-120 chassis is 13 inches wide by 9 1/2 inches deep. The output binding posts add another inch to the overall depth of the amp - SO - 10 1/2 inches overall depth of the amp if you add the binding post depth to the depth of the chassis itself.

    Bob

    audiobill

    Posts : 271
    Join date : 2014-03-13
    Location : Philadelphia

    Re: VTA amplifier gain

    Post by audiobill on Wed Aug 20, 2014 1:43 pm

    Thanks again, Bob.

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