krw@notreal.com wrote in news:759jud1j68ala8nak7ncndtdhr9nojft0v@4ax.com:> On Mon, 12 Nov 2018 13:24:14 +1100, Clifford Heath > <no.spam@please.net> wrote: > >>On 12/11/18 1:09 pm, krw@notreal.com wrote: >>> On Sun, 11 Nov 2018 11:05:02 +0000, TTman <kraken.sankey@gmail.com> >>> wrote: >>> >>>> On 11/11/2018 04:39, guitar-lead@myband.com wrote: >>>>> Need schematic for a 100 megawatt audio amplifier using vacuum >>>>> tubes. >>>>> >>>>> >>>> I have one for 900KW if that's any good... can't you lower your >>>> sights a bit ? >>> >>> That's only .5dB short of the spec. >>20.45dB - you missed two zeroes. > > My eyes skipped right over them. ;-) >Mega skipped. What dB amount does it take to make a sound "sound" twice as loud to a human? (it is an easy question). Perhaps amps of this level should be measured in decabels. (DaB) That'll make the weed folks happier.
Need schematic for a 100 megawatt audio amplifier
Started by ●November 11, 2018
Reply by ●November 12, 20182018-11-12
Reply by ●November 12, 20182018-11-12
On Mon, 12 Nov 2018 17:36:56 +0000 (UTC), DecadentLinuxUserNumeroUno@decadence.org wrote:>Cursitor Doom <curd@notformail.com> wrote in news:psagtb$9gs$17@dont- >email.me: > >> On Sun, 11 Nov 2018 15:38:39 -0800, Jeff Liebermann wrote: >> >>> I suspect that the difficulty getting my heart kick started >>> might be responsible for my inability to properly abbrev. >> >> Did it also leave you with a life-long stutter? >> ;)>Only when he writes the word "computer". He stutters out "computah" every >time. >Or maybe that is another s.e.d poster.Guilty as charged: <https://www.google.com/search?q=%22computah%22> 14,600 hits and increasing. computer = a person who makes calculations, especially with a calculating machine. computah = a machine that computes.> Hehehe... hic... hehehe...<https://www.google.com/search?q=hiccup+cure> -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
Reply by ●November 12, 20182018-11-12
On 11/12/2018 11:52 AM, DecadentLinuxUserNumeroUno@decadence.org wrote:> krw@notreal.com wrote in > news:759jud1j68ala8nak7ncndtdhr9nojft0v@4ax.com: > >> On Mon, 12 Nov 2018 13:24:14 +1100, Clifford Heath >> <no.spam@please.net> wrote: >> >>> On 12/11/18 1:09 pm, krw@notreal.com wrote: >>>> On Sun, 11 Nov 2018 11:05:02 +0000, TTman <kraken.sankey@gmail.com> >>>> wrote: >>>> >>>>> On 11/11/2018 04:39, guitar-lead@myband.com wrote: >>>>>> Need schematic for a 100 megawatt audio amplifier using vacuum >>>>>> tubes. >>>>>> >>>>>> >>>>> I have one for 900KW if that's any good... can't you lower your >>>>> sights a bit ? >>>> >>>> That's only .5dB short of the spec. >>> 20.45dB - you missed two zeroes. >> >> My eyes skipped right over them. ;-) >> > > Mega skipped. > > What dB amount does it take to make a sound "sound" twice as loud to a > human? > > (it is an easy question). > > Perhaps amps of this level should be measured in decabels. (DaB) > > That'll make the weed folks happier. >Did you ever see the 5 ft woofer the built by the guys on Myth Buster?. They connected it to a an automobile driveshaft with an eccentric arm. Starts at about 1:53.> https://www.youtube.com/watch?v=9M9GjeeUk-4--- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
Reply by ●November 12, 20182018-11-12
On Mon, 12 Nov 2018 05:42:26 -0800 (PST), Anthony Stewart <tony.sunnysky@gmail.com> wrote:>On Saturday, 10 November 2018 23:39:41 UTC-5, guita...@myband.com wrote: >> Need schematic for a 100 megawatt audio amplifier using vacuum tubes. > >I recall the 1st US festival with 30 bands in San Bernadino started by >Wozniak in the early 80's had a 1 Megawatt audio system. It was impressive. > >With stacked 1mx1m speakers in arrays larger than a two drive-in movie >screens in stereo, and it was HiFi quality. The satellite speakers on >towers had perfect delay also had a water jet on a turret to cool the >audience between sets. You would dry out in 5 minutes. Unlike >Woodstock, it was well-planned, and well-managed. > >https://en.wikipedia.org/wiki/US_Festival#Labor_Day_Weekend,_1982Some details on the sound system: <https://www.prosoundweb.com/topics/sound_reinforcement/us_festival/> 8 pages. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
Reply by ●November 12, 20182018-11-12
On Mon, 12 Nov 2018 10:24:31 -0800, Jeff Liebermann <jeffl@cruzio.com> wrote:>Some details on the sound system: ><https://www.prosoundweb.com/topics/sound_reinforcement/us_festival/> >8 pages.Well, not quite a 1 megawatt system: <https://www.prosoundweb.com/topics/sound_reinforcement/us_festival/2/> Press releases reported the US Festival system�s audio power rating as being 400,000 watts. The 1982 US Festival relied entirely upon truck-mounted generators for its power source. For 1983, special power lines were brought in from a mile away, and which had been connected to the local Consolidated Edison grid. As emergency backup, a V-16 Caterpillar diesel was constantly idling, ready to drive a one million-watt generator set. Clair�s Rex Ray reports that his company�s system had 800-amp, three-phase service available. "We are drawing about 425 to 540 amps per leg out of the available 800 - occasional peaks are seen to 500 during the loudest acts," he says. "We also see occasional peaks of over 500 amps on the neutral..." -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
Reply by ●November 12, 20182018-11-12
On Mon, 12 Nov 2018 17:36:56 +0000 (UTC), DecadentLinuxUserNumeroUno@decadence.org wrote:>Cursitor Doom <curd@notformail.com> wrote in news:psagtb$9gs$17@dont- >email.me: > >> On Sun, 11 Nov 2018 15:38:39 -0800, Jeff Liebermann wrote: >> >>> I suspect that the difficulty getting my heart kick started >>> might be responsible for my inability to properly abbrev. >> >> Did it also leave you with a life-long stutter? >> ;) >> >> > >Only when he writes the word "computer". He stutters out "computah" every >time. >Or maybe that is another s.e.d poster. > > Hehehe... hic... hehehe...Some feminists might kill me, but "computer" originally referred to educated unmarried women (spinsters) that were employed by astronomers to perform routine calculations. Often this working relationship ended up so that the astronomer married his "computer", often a win-win situation for both.
Reply by ●November 12, 20182018-11-12
On Mon, 12 Nov 2018 20:47:40 +0200, upsidedown@downunder.com wrote:>On Mon, 12 Nov 2018 17:36:56 +0000 (UTC), >DecadentLinuxUserNumeroUno@decadence.org wrote: > >>Cursitor Doom <curd@notformail.com> wrote in news:psagtb$9gs$17@dont- >>email.me: >> >>> On Sun, 11 Nov 2018 15:38:39 -0800, Jeff Liebermann wrote: >>> >>>> I suspect that the difficulty getting my heart kick started >>>> might be responsible for my inability to properly abbrev. >>> >>> Did it also leave you with a life-long stutter? >>> ;) >>> >>> >> >>Only when he writes the word "computer". He stutters out "computah" every >>time. >>Or maybe that is another s.e.d poster. >> >> Hehehe... hic... hehehe... > >Some feminists might kill me, but "computer" originally referred to >educated unmarried women (spinsters) that were employed by astronomers >to perform routine calculations.Not just astronomers. Physicists used more than a few "computers" on the Manhattan project. Bletchley Park had one or two, also. Before that, there was big business in artillery tables.> >Often this working relationship ended up so that the astronomer >married his "computer", often a win-win situation for both.
Reply by ●November 12, 20182018-11-12
On 13/11/18 6:10 am, krw@notreal.com wrote:> On Mon, 12 Nov 2018 20:47:40 +0200, upsidedown@downunder.com wrote: > >> On Mon, 12 Nov 2018 17:36:56 +0000 (UTC), >> DecadentLinuxUserNumeroUno@decadence.org wrote: >> >>> Cursitor Doom <curd@notformail.com> wrote in news:psagtb$9gs$17@dont- >>> email.me: >>> >>>> On Sun, 11 Nov 2018 15:38:39 -0800, Jeff Liebermann wrote: >>>> >>>>> I suspect that the difficulty getting my heart kick started >>>>> might be responsible for my inability to properly abbrev. >>>> >>>> Did it also leave you with a life-long stutter? >>>> ;) >>>> >>>> >>> >>> Only when he writes the word "computer". He stutters out "computah" every >>> time. >>> Or maybe that is another s.e.d poster. >>> >>> Hehehe... hic... hehehe... >> >> Some feminists might kill me, but "computer" originally referred to >> educated unmarried women (spinsters) that were employed by astronomers >> to perform routine calculations. > > Not just astronomers. Physicists used more than a few "computers" on > the Manhattan project. Bletchley Park had one or two, also. Before > that, there was big business in artillery tables. >> >> Often this working relationship ended up so that the astronomer >> married his "computer", often a win-win situation for both.Charles Babbage was a human computer, one of a couple of dozen (but not women) who were paid to calculate navigational tables, log tables, astronomical ephemera, etc. The experience was what motivated the Difference Engine. There's a good write-up on this in James Gleick's "The Information". Highly recommended. Clifford Heath.
Reply by ●November 12, 20182018-11-12
by far, most of the power is in the bass drum and guitar below 100 Hz. Take those away and you need 10 to 15 dB less. m
Reply by ●November 12, 20182018-11-12
On Sun, 11 Nov 2018 07:50:41 -0800, doh wrote:> On Sun, 11 Nov 2018 00:59:17 -0500, bitrex <user@example.net> wrote: > >>On 11/10/2018 11:39 PM, guitar-lead@myband.com wrote: >>> Need schematic for a 100 megawatt audio amplifier using vacuum tubes. >>> >>> >>You might have to compromise a bit and run it class B though. I hope >>that's alright. It'll sound okay in the cheap seats but true audiophiles >>won't be impressed. > > I don't think the neighbors would be impressed, either.Ummm, maybe not "impressed", but I'd bet they'd be "blown away" - literally! In a more practical vein, let's see, the biggest tubes I know about are something like the 4CX100,000, so you'd need to parallel something like 1000 of these tubes to deliver that power. These tubes cost something like $50,000 or maybe $100K each, so that's 100 Million right there. The output transformer would be the size of a utility substation transformer, but wound with Litz wire, so you'd have to radically up the cost. It would have a HELL of a turns ratio, for 18KV on the plates and 8 Ohm output. So, the output would be bus bars several feet square, I'd think. Can't imagine what a voice coil for that would look like. Also, the plate cooling system would be plenty impressive. At the National Superconducting Cyclotron Center, they run 2 big cyclotrons together, and the plate supply is 42-46 A at 18,000 V. (That's roughly 3/4 megawatt.) It certainly impresses the HELL out of me! Jon
