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    How to use two VTA ST-70's?

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    Dave_in_Va

    Posts : 204
    Join date : 2013-04-02

    How to use two VTA ST-70's?

    Post by Dave_in_Va on Thu Mar 30, 2017 11:31 pm

    If you had two of them and wanted to use one for each channel, how would you hook them up?
    (Sorry, too late for me to figure this out for myself.)

    Thanks in advance.
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    peterh

    Posts : 882
    Join date : 2012-12-25
    Location : gothenburg, sweden

    Re: How to use two VTA ST-70's?

    Post by peterh on Fri Mar 31, 2017 2:35 am

    Dave_in_Va wrote:If you had two of them and wanted to use one for each channel, how would you hook them up?
    (Sorry, too late for me to figure this out for myself.)

    Thanks in advance.
    Parallelling is really no option as the tubes are probably not that equal. It might
    be ok for a PA system, but if hifi is the goal - no.

    I would sell both and buy a vta120 for the money. Or change speakers to
    something more sensitive. Or buy 2 MkIII .


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    Peter W.

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

    Re: How to use two VTA ST-70's?

    Post by Peter W. on Fri Mar 31, 2017 7:20 am

    Dave_in_Va wrote:If you had two of them and wanted to use one for each channel, how would you hook them up?
    (Sorry, too late for me to figure this out for myself.)

    Thanks in advance.

    Do they not have a mono-stereo switch?  If so, that is your answer.

    Each individual amp becomes, effectively a 4-output-tube mono amp.
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    peterh

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    Join date : 2012-12-25
    Location : gothenburg, sweden

    Re: How to use two VTA ST-70's?

    Post by peterh on Fri Mar 31, 2017 7:33 am

    Peter W. wrote:
    Dave_in_Va wrote:If you had two of them and wanted to use one for each channel, how would you hook them up?
    (Sorry, too late for me to figure this out for myself.)

    Thanks in advance.

    Do they not have a mono-stereo switch?  If so, that is your answer.

    Each individual amp becomes, effectively a 4-output-tube mono amp.
    Each individual amp will get 2 output's that might be slightly different. To drive
    2 separate speakers it will work, but if driving one speaker chances are that
    the amps will counteract each other due to differences in amplification.
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    Bob Latino
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    Join date : 2008-11-26
    Location : Massachusetts

    Re: How to use two VTA ST-70's?

    Post by Bob Latino on Fri Mar 31, 2017 7:59 am

    Dave_in_Va wrote:If you had two of them and wanted to use one for each channel, how would you hook them up?
    (Sorry, too late for me to figure this out for myself.)

    Thanks in advance.

    The best thing to do is explained at the links below in a couple of forum posts from 2011

    Biamping with two ST-70's ...

    The reasons why NOT to run the amps in mono are explained very well by forum member GP49 at the link below ..

    Running ST-70 amps in mono ?

    Bob



    Last edited by Bob Latino on Fri Mar 31, 2017 8:41 am; edited 1 time in total
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    Dave_in_Va

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    Join date : 2013-04-02

    Re: How to use two VTA ST-70's?

    Post by Dave_in_Va on Fri Mar 31, 2017 8:30 am

    Thanks guys. I really don't need more power. I was just curious more than anything.

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