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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


2 posters

    Found a use for my tape out switch

    vtshopdog
    vtshopdog


    Posts : 155
    Join date : 2015-07-11
    Location : UT, USA

    Found a use for my tape out switch Empty Found a use for my tape out switch

    Post by vtshopdog Fri Nov 04, 2016 2:30 pm

    We listen to radio 2 or 3 hours most mornings and there is no need to have consumable tube gear running 15-20 hours a week for this.  I did a rebuild on my SP-12 last spring and rewired the tape out switch as an A/B splitter output downstream of my selector switch to allow access to all sources without firing up the tube gear.

    So it pretty much goes like so:

    All component RCA inputs connected to SP-12 selector switch
    SP-12 selector to Tape switch

    Tape switch "source" position goes on to volume controls, SP-12 board and on to M125's and main system - stock configuration.
    Tape switch "tape out" position goes to back panel "Tape Out" RCA's and on to a small passive preamp (built from Tube Cad A3 stepped attenuator PCB kit) and on to another small power amp and separate small affordable speakers.

    What this allows is I can now listen to all sources without firing up the tube pre (save phono).  Since the passive pre attenuators end up grounding into the SP-12 I was worried about creating ground loops in this mess of possible switch modes, but no issue and probably more dumb luck than any sort of savvy - (I'll take it when it comes my way)


    Added a couple photos in an edit today.

    Found a use for my tape out switch PASS%20PRE.JPG_zpsa5h0q7a2
    Found a use for my tape out switch PRE%20INSIDE.JPG_zpslr8qh1bn
    Roy Mottram
    Roy Mottram
    Admin


    Posts : 1839
    Join date : 2008-11-30

    Found a use for my tape out switch Empty Re: Found a use for my tape out switch

    Post by Roy Mottram Tue Nov 08, 2016 3:55 pm

    VT,
    very smart use of the tape monitor switch!!
    this is almost identical info I give to people who want a "Home Theater Bypass" switch to their expensive/fancy home theater 7.2 receiver.
    vtshopdog
    vtshopdog


    Posts : 155
    Join date : 2015-07-11
    Location : UT, USA

    Found a use for my tape out switch Empty Re: Found a use for my tape out switch

    Post by vtshopdog Tue Nov 15, 2016 8:52 pm

    Ha - I'm not surprised, but "small affordable speakers" placed on the floor tucked against wall in a very sub-optimal location sound, well, pretty bad, even just for listening to NPR in the morning.  

    No "sweet spot" in this setup ...

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    Found a use for my tape out switch Empty Re: Found a use for my tape out switch

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