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Wow, this is a REAL AMPLIFIER !!!!

Started by Unknown October 14, 2011
1015 watts RMS output....

http://www.chambonino.com/construct/const9.html


On Fri, 14 Oct 2011 03:33:45 -0500, jw@myplace.com wrote:

>1015 watts RMS output.... > >http://www.chambonino.com/construct/const9.html >
The problem with using transmitter tubes like 813s is the huge, 2500 volts here, B+ supply. You need a monster, custom, high-ratio, 5KV insulated output transformer, and it's hard to get good HF response from that. John
John Larkin wrote:
> On Fri, 14 Oct 2011 03:33:45 -0500, jw@myplace.com wrote: > >> 1015 watts RMS output.... >> >> http://www.chambonino.com/construct/const9.html >> > > The problem with using transmitter tubes like 813s is the huge, 2500 > volts here, B+ supply. You need a monster, custom, high-ratio, 5KV > insulated output transformer, and it's hard to get good HF response > from that. > > John > >
Yeah, but once you're old enough to be able to afford one, you can't hear up there anyway. ;) Cheers Phil Hobbs
On 10/14/2011 1:33 AM, jw@myplace.com wrote:
> 1015 watts RMS output.... > > http://www.chambonino.com/construct/const9.html > >
MSA260 Variable Switching Frequency PWM Amplifier 9000 Watts 6.6" x 9.8" http://www.cirrus.com/en/products/msa260.html Just add power supply.
On 14 Okt., 17:22, D from BC <myrealaddr...@comic.com> wrote:
> On 10/14/2011 1:33 AM, j...@myplace.com wrote: > > > 1015 watts RMS output.... > > >http://www.chambonino.com/construct/const9.html > > MSA260 Variable Switching Frequency PWM Amplifier > 9000 Watts > 6.6" x 9.8"http://www.cirrus.com/en/products/msa260.html > Just add power supply.
but at max 50KHz pwm I doubt it will do full audio range frequencies ;) something like this: http://www.cadaudio.dk/d2404asw.pdf 2400W@4R 20-20KHz, 9.8" x 6" x 1.8" with power supply list price 309euro ... -Lasse
John Larkin wrote:
> On Fri, 14 Oct 2011 03:33:45 -0500, jw@myplace.com wrote: > >> 1015 watts RMS output.... >> >> http://www.chambonino.com/construct/const9.html >> > > The problem with using transmitter tubes like 813s is the huge, 2500 > volts here, B+ supply. You need a monster, custom, high-ratio, 5KV > insulated output transformer, and it's hard to get good HF response > from that. >
Or you wind a new coil for the speaker. Done it once but never, ever again. I think that was the episode where I used more cusswords than all the rest of my life. It was a huge speaker from a circus that had folded and I needed it to get to a few hundred ohms. Guy plugged in his E-guitar ... *TWWWAAAIIINGGGG* ... thwok ... darkness. The 230V/16A breaker had popped. I guess one could also buy a boatload of small speakers and string them in series but I didn't have that kind of money as a student. The added risk with my amp was that there could be up 900V riding on the speaker coil so nobody was allowed anywhere near it. I am still amazed it didn't arc over because back then I didn't pay much attention to dielectric properties and stuff. -- Regards, Joerg http://www.analogconsultants.com/
On Fri, 14 Oct 2011 07:02:49 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

>On Fri, 14 Oct 2011 03:33:45 -0500, jw@myplace.com wrote: > >>1015 watts RMS output.... >> >>http://www.chambonino.com/construct/const9.html >> > >The problem with using transmitter tubes like 813s is the huge, 2500 >volts here, B+ supply. You need a monster, custom, high-ratio, 5KV >insulated output transformer, and it's hard to get good HF response >from that. > >John >
I was wondering where they get the transformers?????? They must be custom made and very costly. The power transformers might be made for large transmitters, but the output xformers almost have to be custom made. Just curious why the HF response would be poor? Is that due to the thickness of the insulation in the xformer? Now, if I was building this, there would eight output tubes instead of four. Putting out over 2000 watts, and four (quad) channels. Over 8000 watts would make a kick ass stereo (quad) sound system. Of course there is no point in having that much power, but I like to dream about excessive shit like this. I recall reading somewhere that the Woodstock Festival had a 10,000 watt sound system. So my 8000 watt amps could liven up many acres of land and probably get me arrested for excessive noise :)
jw@myplace.com wrote:
> On Fri, 14 Oct 2011 07:02:49 -0700, John Larkin > <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote: > >> On Fri, 14 Oct 2011 03:33:45 -0500, jw@myplace.com wrote: >> >>> 1015 watts RMS output.... >>> >>> http://www.chambonino.com/construct/const9.html >>> >> The problem with using transmitter tubes like 813s is the huge, 2500 >> volts here, B+ supply. You need a monster, custom, high-ratio, 5KV >> insulated output transformer, and it's hard to get good HF response >>from that. >> John >> > > I was wondering where they get the transformers?????? > They must be custom made and very costly. The power transformers > might be made for large transmitters, but the output xformers almost > have to be custom made. >
Typically one would buy them used and rewind them if necessary: http://www.ebay.com/itm/TWO-UMX-300A-LARGE-CONSTANT-VOLTAGE-AUDIO-TRANSFORMERS-/5810439366?cmd=ViewItem&pt=Vintage_Electronics_R2
> Just curious why the HF response would be poor? Is that due to the > thickness of the insulation in the xformer? >
It's actually not poor at all. I was mighty surprised when I had to test some aircraft designs here, so I needed a stiff power source up to 440Hz. Vary the frequency, apply nasty surges, the works. Generator -> big Kenwood amp -> ordinary 60Hz line transformer. After completing the tests I became curious. Now how high would it go? To my surprise this 60Hz transformer easily did several kHz without the core heating up much. And above a few kHz you don't really need much power for audio purposes. However, back when I built my amp there was no Ebay and I couldn't even buy a kilowatt-sized mains transformer. Those cost too much. So I generated slightly over 900VDC from 230VAC, Cockroft-Walton style. In a country where wall outlets where not keyed and you could plug them both ways. Woe to those who didn't measure first and plugged in the "wrong" way ... -> Hint to readers: DO NOT do this! (I was young and foolish back then). [...] -- Regards, Joerg http://www.analogconsultants.com/
On Oct 14, 4:33=A0am, j...@myplace.com wrote:
> 1015 watts RMS output.... > > http://www.chambonino.com/construct/const9.html
http://audiopowerlabs.com/
jw@myplace.com wrote:

> 1015 watts RMS output.... > > http://www.chambonino.com/construct/const9.html > >
I have some 4-1000Z tubes around here. Some new, some only used a little. Maybe I should Ebay them. I don't think I'll be doing much with them in my life time but I wonder what kind of an audio amp they would make? I got these from a place where they used them in EDM machines to operate the quill at 400hz. I also have a supply and output transformer.. Jamie