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1KW power - what do you think?
1KW power - what do you think?
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Old 19th January 2010, 06:11 AM   #11
Eva is offline Eva  Spain
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Everything can (or has already been) done with tubes, but the question is: Would it be practical?

The amplifier project in which I'm working (independent single channel modules) plays up to 10KW peak of music into 2 ohms producing so little heat that a fan is barely required, and is not bigger or heavier than two times an ATX PC power supply. This is achieved with solid state class D and the latest generation of switching transistors.

It's easily transportable and wastes no electricity at all, and yes, I have tested it in raves where electricity supply is not usually good or abundant.

How much would something similar done with tubes weight? How much electricity would be wasted? Would a car be enough to move several amplifier channels from rave to rave?
I use to feel like the small child in The Emperor's New Clothes tale
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Old 19th January 2010, 06:14 AM   #12
stratus46 is offline stratus46  United States
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Originally Posted by Charlie Slee View Post
A 1000 watt solid state amp would be a great challenge, but when your on a mission for a 1000 watt valve amp....
AM radio transmitters used to use plate modulation which meant the RF output included the modulation audio power. The audio amp had to be at least half the RF rating. Now for a 50,000 watt transmitter ..... Look up radio station WLW which was 500 KW. Now THAT's an audio amp that was done in the 1930s - before transistors.

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Old 19th January 2010, 06:25 AM   #13
Brouilly is offline Brouilly  United Kingdom
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Very interesting points Eva, all of which i have thought about. My dream for the 1KW valve amp is really just for me. I would love to build it and use it at my events. Of course it wouldnt always be practical to take it everywhere with me. But in hired venues where I wouldnt be paying the electricity bills I think it would sound great...
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Old 19th January 2010, 06:29 AM   #14
poynton is offline poynton  United Kingdom
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Do it like they did in "the good old days" !!

1 100w Head and a bank of 100w slaves with a mountain of 4 x 12" full-stacks and bass bins.


If it ain't broke, break it !! Then fix it again. It's called DIY !
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Old 19th January 2010, 07:21 AM   #15
richwalters is offline richwalters
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Easier with SS. Several articles in 1980's Elektor magazine had these as projects.

11.20 What is amplifier "bridging" or "monoblocking"? How do I do it?

This site explains when tube amps are bridged. I've done it even though anticipated power is less than for SS.
Make sure that the correct impedance matching is done otherwise as article mentions, output stage will get hammered and current will rocket.

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Old 19th January 2010, 07:33 AM   #16
Geek is offline Geek
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Originally Posted by Charlie Slee View Post
Thanks to all for your responses.

Do you mean 5 amps each dedicated to a certain frequency range?

More like one for each speaker... unless you have a single 1KW speaker... if you do, then you're better off with 1 x 200W amp and 5 speakers

Originally Posted by mosfetmaniac View Post
Death in a glass bottle
No bong joke made yet?

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Old 19th January 2010, 07:33 AM   #17
kavermei is offline kavermei  Belgium
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A 1kW tube amp will be heavy, expensive, hot, dangerous, bright, and lots of fun to switch on
Never send a human to do a machine's job. --Agent Smith
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Old 19th January 2010, 08:49 AM   #18
wrenchone is offline wrenchone  United States
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If you don't insist on getting the 1kW all in one go, 200W bricks would be doable. I was thinking of PPP screen driven sweep tubes, ~600V B+, and 3k primaries.
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Old 19th January 2010, 02:44 PM   #19
MellowTone is offline MellowTone  Australia
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1KW power - what do you think?
Originally Posted by mosfetmaniac View Post
1KW using 4 x 813 Transmitter tubes and a 2.5KV power supply.
Death in a glass bottle

Champ 1000 Watt Tube Amp
That was exactly where I was going to direct Charlie.

I'm not sure If I'd trust that much voltage near ravers (although I guess they manage to not destroy anything when there are wall sockets in abundance...)

Ignoring the expense and weight issues, the thing I would be wanting to know is, can you get a good enough power supply where you're going to power these? I would assume you would be wanting stereo for this, and that would be taking a whole lot of power, more than my GPO can supply at least (I don't think many rave locations have 3-phase handy?)

Just my 2c.
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Old 19th January 2010, 02:55 PM   #20
Glowbug is offline Glowbug  United States
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I've been around enough 1kW+ RF amps to know that I'd hate to move one around for a portable sound system

Those hypersil transformers mean business.
The machine does not isolate us from the great problems of nature but plunges us more deeply into them. - Antoine de Saint-Exupéry
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