The Dynaco Tube Audio Forum

Dedicated to the restoration and preservation of all original Dynaco tube audio equipment - Customer support for Dynaco VTA tube amp kits, all Tubes4hifi.com products and all Dynakitparts.com products


    Unequal load St 70 ?

    Share

    Greg_M

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

    Unequal load St 70 ?

    Post by Greg_M on 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?

    GP49

    Posts : 735
    Join date : 2009-04-30
    Location : East of the sun and west of the moon

    Re: Unequal load St 70 ?

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

    No.

    Sal

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

    Re: Unequal load St 70 ?

    Post by Sal on 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

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

    Re: Unequal load St 70 ?

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

    Thank You

    j4570

    Posts : 141
    Join date : 2010-08-30

    Re: Unequal load St 70 ?

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

    Curious,

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

    Greg_M

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

    Re: Unequal load St 70 ?

    Post by Greg_M on 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.....

    j4570

    Posts : 141
    Join date : 2010-08-30

    Re: Unequal load St 70 ?

    Post by j4570 on 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

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

    Re: Unequal load St 70 ?

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

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

    j4570

    Posts : 141
    Join date : 2010-08-30

    Re: Unequal load St 70 ?

    Post by j4570 on 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

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

    Re: Unequal load St 70 ?

    Post by Greg_M on 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.

    Sponsored content

    Re: Unequal load St 70 ?

    Post by Sponsored content Today at 10:01 pm


      Current date/time is Wed Dec 07, 2016 10:01 pm