Hi Jay;
Another great question, that I can't answer. The continuous watts would
probably meter at 100 watts or so, but the transient peaks can be quite
a bit more. How much more, depends on how fast your meter capture is,
but the ear can hear up to 20 kHz, and my meter can't catch transients
anywhere close to that.
Having a power supply that can handle those musical transients is
important, even if I can't measure it. The power supply can cause some
compression of the sound. I've already run into that, with transformers
on the tube amps, inverter sizing, battery sizing, and Vac.
As Dave mentioned, the AC voltage can really matter to these amps, and
to bring EVH (rip) again into a seemingly unrelated industry, Eddie used
a Variac to feed his Marshall amps lower voltages, to operate at lower
volume to get his "Brown sound".
All that aside, I'm thinking an Exeltech XP1100 might be plenty, and is
a known, high quality waveform. But then I'd have to add a separate DC
charger with its own possible noise issues. I've used Samlex very
little, but seen their inverters survive serious abuse in others'
installs, so I look forward to hearing more about Bryan's studio build,
too.
Ray Walters
Remote Solar
303 505-8760
On 10/22/20 5:29 PM, Jay wrote:
Hi Ray
How many watt do you need?
Jay
On Oct 22, 2020, at 4:42 PM, Ray <r...@solarray.com> 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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