Hi Ray, Given how small your load is and with what Bryan has suggested, it would be a very inexpensive way to go.
If you need battery charging while using it and you find noise through battery charger then using a 2 battery system with harness of Anderson connectors would all you to disconnect one and charge it, and then swap without losing power to the inverter. Cheers Jay > On Oct 22, 2020, at 8:56 PM, Ray <[email protected]> wrote: > > 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 <[email protected]> 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 >>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> List Address: [email protected] >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> There are two list archives for searching. 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