The load was 8 Marshall Super Leads for my application. And while EVH used a variac for test and studio in early days, he toured with Super Leads and then to the EVH amps with 4 6L6 vacuum tubes each. A few others also. I saw his backstage set-up in the 80's and he had an AC supply regulator with an AGM or GEL based battery for transients. This power system could work in anywhere in the world from various main supplies.
I think it would be great if there was a part of this forum titled "in the weeds" or ? for semi off topic stuff. I posted this from an offsite email question but it would be nice to archive a bit and not be so concerned with self promotion. It still is a great forum and thank-you to Mr. W and the group. FRIDAY ! Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ e-mail [email protected] text 209 813 0060 On Thu, 22 Oct 2020 19:57:37 -0600, 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. When one doesn't work, try >>> the other: >>> https://www.mail-archive.com/[email protected]/ >>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> >>> List rules & etiquette: >>> http://www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> http://www.members.re-wrenches.org >>> >> _______________________________________________ >> 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. When one doesn't work, try >> the other: >> https://www.mail-archive.com/[email protected]/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> > _______________________________________________ > 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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