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    CV Transformer - and Clean Power for Your System

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    Peter W.

    Posts : 748
    Join date : 2016-08-07
    Location : Melrose Park, PA

    CV Transformer - and Clean Power for Your System

    Post by Peter W. on Wed Dec 13, 2017 9:11 am

    https://www.alliedelec.com/solahd-23-23-210-8/70098582/  

    Here is a possible solution for high/low voltage conditions: A harmonically compensated Constant Voltage transformer capable of 8A, albeit at a price. As these things tend to make some (audible) noise at the extremes, I would suggest mounting it near the service panel, then running the regulated line to the stereo. At 8A, it should be adequate for most systems. But it has the virtues of simplicity, reliability and low maintenance. Not terribly expensive as measured against the typical high-end audio component these days, either. More money gets a bigger one, if needed.

    No variacs, no voltage regulators and will handle high and low incoming voltage conditions. My direct experience with (uncompensated) CV transformers is that they are reasonably good with surges and sags as well. However, an uncompensated device is very much NOT suggested for an audio application as the output waveform is pretty wretched.
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    sKiZo

    Posts : 1466
    Join date : 2013-04-01
    Location : Michigan USA

    Re: CV Transformer - and Clean Power for Your System

    Post by sKiZo on Wed Dec 13, 2017 10:53 pm

    Too bad you can't adjust the output - be nice to dial it back from 120vac to the maybe 117vac a lot of tube equipment is happier with ...

    GP49

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

    Re: CV Transformer - and Clean Power for Your System

    Post by GP49 on Wed Dec 13, 2017 11:54 pm

    I used a small one, same manufacturer (Sola) on my turntable (induction motor, thus somewhat prone  to speed variation with mains voltage) when I lived in San Francisco where line voltage at my apartment was variable from 103 VAC to 127 VAC.  The electric utility has replaced pole-mounted equipment and built a new substation since, with concomitant improvement both in voltage stability and emitted noise.

    I found that the Thorens TD-124 turntable was less stable in speed with voltage variation than the Garrard 301.  In fact it was less so than the Garrard AT-6 record changer (which admittedly had to be designed to spin one, up to a stack of eight records and run an automatic cycling and record change mechanism).
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    deepee99

    Posts : 1965
    Join date : 2012-05-23
    Location : Wallace, Idaho

    Re: CV Transformer - and Clean Power for Your System

    Post by deepee99 on Fri Dec 22, 2017 4:28 pm

    Peter W. wrote:https://www.alliedelec.com/solahd-23-23-210-8/70098582/  

    Here is a possible solution for high/low voltage conditions: A harmonically compensated Constant Voltage transformer capable of 8A, albeit at a price. As these things tend to make some (audible) noise at the extremes, I would suggest mounting it near the service panel, then running the regulated line to the stereo. At 8A, it should be adequate for most systems. But it has the virtues of simplicity, reliability and low maintenance. Not terribly expensive as measured against the typical high-end audio component these days, either. More money gets a bigger one, if needed.

    No variacs, no voltage regulators and will handle high and low incoming voltage conditions. My direct experience with (uncompensated) CV transformers is that they are reasonably good with surges and sags as well. However, an uncompensated device is very much NOT suggested for an audio application as the output waveform is pretty wretched.
    Boy, that price-tag puts it right up there with a Furman, which clamps at 121VAC and generates no audible noise even if parked on the outlet end right next to the hi-fi gear. That would be a tad high for vintage Dynaco equip. but works fine with Roy's and Bob's stuff.

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