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<p>Hi Ray,</p>
<p>I'll chime in on this one. My Magnum MS4024 is fine for old tube amps and the recording equipment in my studio -- very low noise floor -- but I have to power guitar pedals with 9v batteries. Powering the pedals with wall warts causes a huge 60Hz buzz. I've tried different transformers, different receptacles, no dice -- have to use 9v batteries. The pedals, however, seem to be the only things that are affected. Everything else is very quiet.</p>
<p>I was told years ago that the MagnaSines have 660 steps per AC cycle, and the OutBack FXs have 330. The Trace SW series had 32 steps.</p>
<p><span style="font-family: georgia, palatino, serif;">--</span><br /><span style="font-family: georgia, palatino, serif;"> Russell Mueller</span><br /><span style="font-family: georgia, palatino, serif;">BUFFALO SOLAR LLC</span><br /><span style="font-family: georgia, palatino, serif;"> Taos, New Mexico</span><br /><span style="font-family: georgia, palatino, serif;"> 575-770-4877</span><br /><br /></p>
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<p id="reply-intro">On 2020-10-22 16:42, Ray wrote:</p>
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<div class="pre" style="margin: 0; padding: 0; font-family: monospace"><span style="white-space: nowrap;">Hi All;</span><br /><br />I've just had an inquiry on building a portable sound stage and recording setup. Traditionally we've always used Exeltech, as they've had the cleanest output, with background buzz on tube amps being lower than grid power. Modsine were horrible, Old Trace SWs were pretty intolerable, Magnum's were usable, but still noticeably more buzz than grid. I think THD is roughly associated with the background buzz, but there might be certain harmonics that are particularly problematic. I haven't gotten into looking at the separate harmonics relative to what induces the most noise in these old vacuum tube circuits.<br /><br />This is a 48 v application that also needs a built in charger with transfer switching. Exeltech does not appear to have anything in that department. Any other choices? How are Samlex?<br /><br /><span style="white-space: nowrap;">As always, thanks in advance for your time and expertise,</span><br /><br />-- <br /><span style="white-space: nowrap;">Ray Walters</span><br /><span style="white-space: nowrap;">Remote Solar</span><br /><span style="white-space: nowrap;">303 505-8760</span><br /><br />_______________________________________________<br /><span style="white-space: nowrap;">List sponsored by Redwood Alliance</span><br /><br /><span style="white-space: nowrap;">List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a></span><br /><br /><span style="white-space: nowrap;">Change listserver email address & settings:</span><br /><span style="white-space: nowrap;"><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" target="_blank" rel="noopener noreferrer">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a></span><br /><br /><span style="white-space: nowrap;">There are two list archives for searching. When one doesn't work, try the other:</span><br /><span style="white-space: nowrap;"><a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" target="_blank" rel="noopener noreferrer">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a></span><br /><span style="white-space: nowrap;"><a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" target="_blank" rel="noopener noreferrer">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a></span><br /><br /><span style="white-space: nowrap;">List rules & etiquette:</span><br /><span style="white-space: nowrap;"><a href="http://www.re-wrenches.org/etiquette.htm" target="_blank" rel="noopener noreferrer">http://www.re-wrenches.org/etiquette.htm</a></span><br /><br /><span style="white-space: nowrap;">Check out or update participant bios:</span><br /><span style="white-space: nowrap;"><a href="http://www.members.re-wrenches.org" target="_blank" rel="noopener noreferrer">http://www.members.re-wrenches.org</a></span><br /><br /></div>
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