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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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    Amp for tri-amp system

    coolhandjjl
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    coolhandjjl


    Posts : 5
    Join date : 2012-12-28
    • Post n°1

    Amp for tri-amp system Empty Amp for tri-amp system

    Post by coolhandjjl Fri Dec 28, 2012 1:18 am

    I have a tri-amp system, and am considering a tube power amp for the midrange. Right now, all three amps are stereo ss amps. My midrange consists of a Radian 950-PB 2" compression driver mounted on a custom fabricated tractrix design horn, with the driver itself rated with an efficiency of 111dB.
    I don't need much power, the ST70 looks like the lowest one. With my midrange driver being so sensitive, would the ST70 be a viable contender seeing I would probably only be driving it in the milli-watt range? Would there be noise that may show up?
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    Bob Latino
    Bob Latino
    Bob Latino
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    • Post n°2

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    Post by Bob Latino Fri Dec 28, 2012 10:13 am

    With 111 dB efficient speakers and the fact that you would only be using an ST-70 for a portion of the audio range, the ST-70 would be a good choice and have plenty of power. As for noise levels, nearly all variants of the Dynaco ST-70 have very quiet backgrounds. If you do get noise on any ST-70 type amp, it is either power supply hum (on older original ST-70's) or a noisy driver tube on a modern ST-70 like the VTA ST-70.

    Bob
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    wildiowa
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    wildiowa


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    • Post n°3

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    Post by wildiowa Fri Dec 28, 2012 10:18 am

    A vintage ST70 updated with new caps etc. is a great sounding amp as are the new models (more dependable) and would be great in almost any application. Do you currently have one or are you considering a kit build...just curious, why go to tubes for the mids on your system or is this the first step towards an all tube setup? Good luck...
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    coolhandjjl
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    coolhandjjl


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    Post by coolhandjjl Fri Dec 28, 2012 4:27 pm

    This is my first venture into tubes for hi-fi. I also play bass guitar, and have a tube pre-amp with a solid state power amp for that.

    I have read that horns sound best with tubes, and my tri-amp hi-fi system is all horn based. Seeing that my mids are 400Hz ~ 6500kHz, it seems like that is the place to start with tubes for me.
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    Tube Nube
    Tube Nube
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    • Post n°5

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    Post by Tube Nube Mon Jan 07, 2013 9:01 pm

    I predict that you will quickly opt for equalization, as in getting more tube amps to drive all your drivers.

    ;-)

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