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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

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VTA ST-70 or STA-120 with Quad ESL-57's?

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StevieRay

Posts: 4
Join date: 2009-01-09

VTA ST-70 or STA-120 with Quad ESL-57's?

Post by StevieRay on Fri Jan 09, 2009 3:26 pm

Has anyone out there heard the Quad ESL's with either of the VTA ST-70 or ST-120 kits?

The original Dynaco was always recommended as a good match with the ESL, but I'm concerned that with the new driver board the amp maybe unstable because of the feedback circuit or other changes.

Any thoughts? Hi- or low-gain preferences with the ESL-57?

Thanks

Bob Latino
Admin

Posts: 1955
Join date: 2008-11-26
Location: Massachusetts

Re: VTA ST-120 driving difficult loads

Post by Bob Latino on Fri Jan 09, 2009 3:48 pm

StevieRay,

Over the past year I have not found one speaker that is incompatible with the VTA ST-120. It has proven itself to be stable driving any and all speaker loads. I know someone in PA who uses an ST-120 to drive two Martin Logan CLS electrostatic speakers with great success. I can give you more information if send me a PM (personal message) off this board. You can also Email me at Bob01605@aol.com.

Bob Latino

tubes4hifi
Admin

Posts: 995
Join date: 2008-11-30

Quads with VTA amps

Post by tubes4hifi on Sat Jan 10, 2009 4:16 pm

I haven't had any Quad users give me any feedback, but I've had probably a half dozen VTA owners with Martin-Logan speakers write about the amazing sound of this combination.
The VTA amp is much more stable than the Dynaco original as the orginal circuit was more about low cost than hi performance, and it was very marginal with loop gain and frequency response, neither a problem with the VTA design.
Roy www.tubes4hifi.com
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