<div dir="auto">Wrenches<div dir="auto">I have built solar powered sound stages, power trailers for both music and drive in movies, l only use outback, never any complaints, some acts prefer over dirty grid power. I had sunpower positive grounded arrays, AC-DC Coupled arrays. I had a guy use SMA and had all kinds of issues, mainly operator error. We did a full trailer, green room and light bars, powered drop down doors, but it was a little big.</div><div dir="auto">Jerry</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Oct 22, 2020, 3:42 PM Ray <<a href="mailto:ray@solarray.com">ray@solarray.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi All;<br>
<br>
I've just had an inquiry on building a portable sound stage and <br>
recording setup. Traditionally we've always used Exeltech, as they've <br>
had the cleanest output, with background buzz on tube amps being lower <br>
than grid power. Modsine were horrible, Old Trace SWs were pretty <br>
intolerable, Magnum's were usable, but still noticeably more buzz than <br>
grid. I think THD is roughly associated with the background buzz, but <br>
there might be certain harmonics that are particularly problematic. I <br>
haven't gotten into looking at the separate harmonics relative to what <br>
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 <br>
transfer switching. Exeltech does not appear to have anything in that <br>
department. Any other choices? How are Samlex?<br>
<br>
As always, thanks in advance for your time and expertise,<br>
<br>
-- <br>
Ray Walters<br>
Remote Solar<br>
303 505-8760<br>
<br>
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