Hi Ray,
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.
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.
--
Russell Mueller
BUFFALO SOLAR LLC
Taos, New Mexico
575-770-4877
On 2020-10-22 16:42, Ray wrote:
Hi All;
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.
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?
As always, thanks in advance for your time and expertise,
--
Ray Walters
Remote Solar
303 505-8760
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