The work I did on this back in the day, when I was into this kind of thing was setting AC voltage for the amps. Marshall and other really nice sounding guitar amps need a specific AC voltage to sound great and get good tube life. I can't remember the voltages exactly but they are out there to find in a search. Bands that are touring, bias the tubes at say 117vac and then run them on stage from an adjustable supply. I used the Xantrex config tool to set XW's for the exact output Vac under typical loading. This was to replace an existing Japanese company that built stage power supplies. They had got very expensive and were hard to find and get support. I never noticed any big noise difference from the grid vs XW supply but the sound quality was noticeable to me when the voltage was right. That was a fun job but really bad hours!
Still not getting over losing Eddie Van Halen. He was a master at great sound and nothing between the guitar and his amps but a cable or RF transmitter. He also made his own guitars and amps, even when he could afford to hire it. He used all 10 fingers in his neck tapping techniques. 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 16:42:03 -0600, 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, _______________________________________________ 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
