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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


4 posters

    Unequal load St 70 ?

    Greg_M
    Greg_M


    Posts : 40
    Join date : 2010-09-18
    Location : Poulsbo, WA

    Unequal load St 70 ? Empty Unequal load St 70 ?

    Post by Greg_M Mon May 16, 2011 10:21 pm

    I am thinking of using my ST70 in a situation where there will be a mono input and each output might have a different ohm load. Say an 8 ohm output on one channel and a 16 on the other. Would that hurt the amp?
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    GP49


    Posts : 792
    Join date : 2009-04-30
    Location : East of the sun and west of the moon

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    Post by GP49 Tue May 17, 2011 1:06 am

    No.
    Sal
    Sal


    Posts : 221
    Join date : 2009-02-05
    Location : Central New Jersey Dynaco-ST70.com

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    Post by Sal Tue May 17, 2011 10:43 am

    As long as the 8 om speaker is connected to the 8 ohm tap and the 16 ohm speaker is connected to the 16 ohm tap there will be no problem.

    Sal
    Greg_M
    Greg_M


    Posts : 40
    Join date : 2010-09-18
    Location : Poulsbo, WA

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    Post by Greg_M Wed May 18, 2011 7:30 am

    Thank You
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    j4570


    Posts : 150
    Join date : 2010-08-30

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    Post by j4570 Wed May 18, 2011 9:40 pm

    Curious,

    What's the what if? That sounds really unique. Guitar Amp?
    Greg_M
    Greg_M


    Posts : 40
    Join date : 2010-09-18
    Location : Poulsbo, WA

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    Post by Greg_M Wed May 18, 2011 9:54 pm

    I'm building a leslie speaker. It typically has 16 ohm drivers for bass and treble. But the original drivers are pretty expensive and will not handle a lot of power. Same with the bass speaker. So if/when I wish to replace them, it will be easier to use 8 ohm speakers. The original tube amps used for these (although being sought now by the guitar crowd) are not HiFi. And....I have this spare ST70 sitting around.....
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    j4570


    Posts : 150
    Join date : 2010-08-30

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    Post by j4570 Wed May 18, 2011 10:14 pm

    Are they really that rare? A roomate of mine had one for an organ. I actually repaired it about 15 years ago. Just needed a new diode in the bridge rectifier.

    So by different load, you mean one channel on low, one on high frequency. It put out good volume, for the not so much power. Great organ sound.

    Oh, he still has it, last I heard. Don't think he'll be parting with it. That's probably more of the problem, people know what they have.

    Jason
    Greg_M
    Greg_M


    Posts : 40
    Join date : 2010-09-18
    Location : Poulsbo, WA

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    Post by Greg_M Thu May 19, 2011 6:41 am

    Not rare but expensive
    Yes one channel low and one high.
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    j4570


    Posts : 150
    Join date : 2010-08-30

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    Post by j4570 Thu May 19, 2011 11:17 am

    What's the cost to build (discounting time of course)? Just curious. Or is there a kit out there?
    Greg_M
    Greg_M


    Posts : 40
    Join date : 2010-09-18
    Location : Poulsbo, WA

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    Post by Greg_M Thu May 19, 2011 11:40 am

    Mostly it involves finding the various leslie parts and building a box to put them in. Where you get the parts and how much you pay versus how much you scrounge is a big variable. I hope to come in at the $400-500 range.
    They sell used for 2-3 times that much. But if you are in the right place at the right time you can get them for free like a lot of things

    They still sell them new for a lot of money. No kits that I know of.

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