[RE-wrenches] Sound Equipment Inverter

[Russell Mueller]

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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