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


    ST 70 Mono-Stereo switch on the front of my amp.....Question???

    avatar
    vincentdsnt

    Posts : 5
    Join date : 2012-03-02

    ST 70  Mono-Stereo switch on the front of my  amp.....Question??? Empty ST 70 Mono-Stereo switch on the front of my amp.....Question???

    Post by vincentdsnt on Thu Apr 12, 2012 9:54 pm

    This is my question........Is the Mono-Stereo switch on the ST70 used if you want to run two amps in mono (as in mono block), i.e. 60 watt amp per channel or is it to select between mono and stereo format?? Thank You for your help.
    avatar
    GP49

    Posts : 791
    Join date : 2009-04-30
    Location : East of the sun and west of the moon

    ST 70  Mono-Stereo switch on the front of my  amp.....Question??? Empty Re: ST 70 Mono-Stereo switch on the front of my amp.....Question???

    Post by GP49 on Fri Apr 13, 2012 12:16 am

    It parallels the two channels into one, sending one channel's input to both amplifier channels as a monoblock amplifier; the outputs of the two amplifier channels are connected together to drive a single channel's loudspeaker. However, as has been discussed here before, this mode of operation is useless for high quality sound. In normal stereo operation, negative feedback signals are intended to correct nonlinearities IN EACH CHANNEL INDIVIDUALLY; when the two channels are paralleled, the feedback signals get combined, too; thus they do not perform this same correction, causing distortion to rise sharply. It does not even double the power, as claimed.
    avatar
    vincentdsnt

    Posts : 5
    Join date : 2012-03-02

    ST 70  Mono-Stereo switch on the front of my  amp.....Question??? Empty Re: ST 70 Mono-Stereo switch on the front of my amp.....Question???

    Post by vincentdsnt on Fri Apr 13, 2012 5:25 am

    GP49, Thank You.........for some reason I thought an ST could be used as a mono block amp, but then I am new to the ways of stereo amp knowledge.

    Sponsored content

    ST 70  Mono-Stereo switch on the front of my  amp.....Question??? Empty Re: ST 70 Mono-Stereo switch on the front of my amp.....Question???

    Post by Sponsored content


      Current date/time is Thu Aug 22, 2019 7:19 pm