On Thu, 15 Nov 2018 07:31:20 -0800, John Larkin <jjlarkin@highlandtechnology.com> wrote:>On Wed, 14 Nov 2018 23:14:59 -0800 (PST), tabbypurr@gmail.com wrote: > >>On Wednesday, 14 November 2018 21:04:51 UTC, John Larkin wrote: >>> On Sun, 11 Nov 2018 10:51:34 -0800 (PST), tabbypurr wrote: >>> >On Sunday, 11 November 2018 04:39:41 UTC, guita...@myband.com wrote: >>> > >>> >> Need schematic for a 100 megawatt audio amplifier using vacuum tubes. >>> > >>> >Mount the control rods on large long throw speaker coils, use the valve amp to drive those. No, won't work, steam doesn't have much frequency response. Maybe use the generators of a nuke plant in amplidyne mode. You'd need to make some custom ones to cover the higher frequencies if this is for audio - I hope it's not. >>> >>> There are some thousands-of-PSI multi-horsepower hydraulic servo >>> valves that get into the hundreds of Hz. Hydraulic bass drivers? >> >>hydraulics are just control & gearing, but it's a way to use a cheap high power drive, the compressor. >> >>> I'm always impressed by big hydraulics. They move mountains, usually >>> with reversed mechanical advantage. But my knees work with reversed >>> mechanical advantage; if I lift a hundred pounds, my muscles must be >>> pulling tons. >>> >>> I wonder why so many guys fanticize about being rock stars. Sounds >>> dreadful to me. >> >>Sounds great to people with no other opportunities. Not stuck in an office all day, saying yes sir yes sir for a bit above minimum wage. Most buy into the money wasted on superficial junk thing. I prefer to do something useful. >> >> >>NT > >The fraction of people with enough musical talent to be stars is in >the parts-per-million. > >What's the SPL where air goes nonlinear, where the negative peaks hit >vacuum? That 100 megawatts wouldn't work on any rock-concert >soundstage.At about 180 dB, the positive peaks are at 2 bar and negative at 0 bar.. Some speakers claim 100 dB/W sensitivity at 1 m, thus 100 MW would be 80 dB higher so 180 dB would be possible, but since multiple speakers would be needed, how would you measure the pressure at 1 m from _all_ , so not practical due to the geometry.
Need schematic for a 100 megawatt audio amplifier
Started by ●November 11, 2018
Reply by ●November 16, 20182018-11-16
Reply by ●November 16, 20182018-11-16
On Fri, 16 Nov 2018 06:31:33 +0200, upsidedown@downunder.com wrote:>On Thu, 15 Nov 2018 07:31:20 -0800, John Larkin ><jjlarkin@highlandtechnology.com> wrote: > >>On Wed, 14 Nov 2018 23:14:59 -0800 (PST), tabbypurr@gmail.com wrote: >> >>>On Wednesday, 14 November 2018 21:04:51 UTC, John Larkin wrote: >>>> On Sun, 11 Nov 2018 10:51:34 -0800 (PST), tabbypurr wrote: >>>> >On Sunday, 11 November 2018 04:39:41 UTC, guita...@myband.com wrote: >>>> > >>>> >> Need schematic for a 100 megawatt audio amplifier using vacuum tubes. >>>> > >>>> >Mount the control rods on large long throw speaker coils, use the valve amp to drive those. No, won't work, steam doesn't have much frequency response. Maybe use the generators of a nuke plant in amplidyne mode. You'd need to make some custom ones to cover the higher frequencies if this is for audio - I hope it's not. >>>> >>>> There are some thousands-of-PSI multi-horsepower hydraulic servo >>>> valves that get into the hundreds of Hz. Hydraulic bass drivers? >>> >>>hydraulics are just control & gearing, but it's a way to use a cheap high power drive, the compressor. >>> >>>> I'm always impressed by big hydraulics. They move mountains, usually >>>> with reversed mechanical advantage. But my knees work with reversed >>>> mechanical advantage; if I lift a hundred pounds, my muscles must be >>>> pulling tons. >>>> >>>> I wonder why so many guys fanticize about being rock stars. Sounds >>>> dreadful to me. >>> >>>Sounds great to people with no other opportunities. Not stuck in an office all day, saying yes sir yes sir for a bit above minimum wage. Most buy into the money wasted on superficial junk thing. I prefer to do something useful. >>> >>> >>>NT >> >>The fraction of people with enough musical talent to be stars is in >>the parts-per-million. >> >>What's the SPL where air goes nonlinear, where the negative peaks hit >>vacuum? That 100 megawatts wouldn't work on any rock-concert >>soundstage. > >At about 180 dB, the positive peaks are at 2 bar and negative at 0 >bar..Correction: It is 194 dB https://en.wikipedia.org/wiki/Sound_pressure#Sound_pressure_level> >Some speakers claim 100 dB/W sensitivity at 1 m, thus 100 MW would be >80 dB higher so 180 dB would be possible, but since multiple speakers >would be needed, how would you measure the pressure at 1 m from _all_ >, so not practical due to the geometry.Thus 100 MW is not quite enough.
Reply by ●November 18, 20182018-11-18
On Thu, 15 Nov 2018 21:27:43 -0500, Phil Hobbs wrote:> (Who used to stand down in the mosh pits of prog rock concerts in the > mid-70s wearing ear plugs and taking photos.You'd need military grade ear-defenders for this band: https://www.youtube.com/watch?v=-bgJC4YSNF4 -- This message may be freely reproduced without limit or charge only via the Usenet protocol. Reproduction in whole or part through other protocols, whether for profit or not, is conditional upon a charge of GBP10.00 per reproduction. Publication in this manner via non-Usenet protocols constitutes acceptance of this condition.
Reply by ●November 18, 20182018-11-18
On Sun, 18 Nov 2018 18:28:09 -0000 (UTC), Cursitor Doom <curd@notformail.com> wrote:>On Thu, 15 Nov 2018 21:27:43 -0500, Phil Hobbs wrote: > >> (Who used to stand down in the mosh pits of prog rock concerts in the >> mid-70s wearing ear plugs and taking photos. > >You'd need military grade ear-defenders for this band: > >https://www.youtube.com/watch?v=-bgJC4YSNF4I used to work for a company that made the headphones football coaches wear on the sidelines. To make sure the devices worked, we needed ambient noise measurements where the devices were to be used. The ambient noise on the sidelines of an Auburn/Alabama game exceeded 120dB, which can cause instant hearing loss. We also sold equipment to train the players to function in that environment. <boggle>
Reply by ●November 25, 20182018-11-25
Jeff Liebermann <jeffl@cruzio.com> writes:>On Sat, 10 Nov 2018 22:39:37 -0600, guitar-lead@myband.com wrote:>>Need schematic for a 100 megawatt audio amplifier using vacuum tubes.>No problem and no vacuum tubes required. A few diesel train engines >driving air compressors feeding a big Wagnerian horn should do the >trick. Modulation would be by pneumatic valve control, fluidics, or >hydraulic modulators.An old prof told of working on a WWII airborne PA system to warn civilians about a pending attack. They ended up with a compressed air driven horn modulated with a slotted plate for a valve, modulated. -- A host is a host from coast to coast.................wb8foz@nrk.com & no one will talk to a host that's close.......................... Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433
Reply by ●November 25, 20182018-11-25
søndag den 25. november 2018 kl. 07.35.52 UTC+1 skrev David Lesher:> Jeff Liebermann <jeffl@cruzio.com> writes: > > >On Sat, 10 Nov 2018 22:39:37 -0600, guitar-lead@myband.com wrote: > > >>Need schematic for a 100 megawatt audio amplifier using vacuum tubes. > > >No problem and no vacuum tubes required. A few diesel train engines > >driving air compressors feeding a big Wagnerian horn should do the > >trick. Modulation would be by pneumatic valve control, fluidics, or > >hydraulic modulators. > > An old prof told of working on a WWII airborne PA system to > warn civilians about a pending attack. They ended up with a > compressed air driven horn modulated with a slotted plate for a > valve, modulated.here mechanical sirens were in use until 1993 and to make sure they worked they were tested every Wednesday at noon, now they are electronic and only tested with sound once a year
