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Old 4th September 2009, 12:03 AM   #11
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Originally Posted by Wavebourn View Post
You should ask there: http://amfone.net/Amforum/index.php

May be some of AMers would suggest you to swap output transformers: they can give you some with speaker outs, you give them yours, for a plate modulation.
Thanx for the lead on that AM'ers group. I'll try that!

I may not want to drive speaker voice coils with these. I may wish to high level modulate a class-C power oscillator running at 28 MHz to drive a big plasma speaker all the way down to woofer crossover point. If so, the present output iron would be useful. These modulators are kinda special and IMO ought to end up doing something 'special'. Many folks have tube amps. No-one I know has high level modulation RF plasma in their sound system.
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Old 4th September 2009, 12:24 AM   #12
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You should get huge plasma flares to match power of such modulators!
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Old 4th September 2009, 12:50 AM   #13
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You should get huge plasma flares to match power of such modulators!
Well actually not nearly so much as you might think. These are 50 watt RMS modulators (rating stamped on the output xfmers) using P-P 809 triodes. They were designed to conservatively modulate a 829B which was making about 70-80 watts CW. In theory I could modulate a power oscillator with as much as 100 watts RMS output.

At 27 MHz, 100 watts of CW RF won't be capable of making a very large 'flame'. I'm gonna guess no more than maybe 1/2 inch long. I anticipate that the flame will have to be horn loaded to the listening room.
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Old 4th September 2009, 02:45 AM   #14
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Well actually not nearly so much as you might think. These are 50 watt RMS modulators (rating stamped on the output xfmers) using P-P 809 triodes. They were designed to conservatively modulate a 829B which was making about 70-80 watts CW. In theory I could modulate a power oscillator with as much as 100 watts RMS output.

At 27 MHz, 100 watts of CW RF won't be capable of making a very large 'flame'. I'm gonna guess no more than maybe 1/2 inch long. I anticipate that the flame will have to be horn loaded to the listening room.
Interesting project!

Are you going to post pictures of the process?
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Old 4th September 2009, 03:56 AM   #15
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Interesting project!

Are you going to post pictures of the process?
Sure I will, if I ever get a round'tuit. As you know, those are pretty hard to find. I've got some projects on the go now that are real time consumers and which I feel are much higher priority. For example a few years ago I mentioned that I was starting to build a very ambitious wind turbine. Well I have been enormously busy ever since doing exactly that.
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Old 4th September 2009, 04:39 AM   #16
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For example a few years ago I mentioned that I was starting to build a very ambitious wind turbine. Well I have been enormously busy ever since doing exactly that.
How is it going?
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Old 14th February 2010, 09:10 AM   #17
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How is it going?
I'm three years into it now and have it about 75% done. Still need to make four airfoil blades and do a bunch more welding. This project was an enormous challenge for me, especially for one person, not well, working all alone. See some pictures and description here.

http://www.microcogen.info/index.php?topic=59.0
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Old 6th May 2012, 12:09 AM   #18
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No luck yet...still looking...LOL this thread came up during a search.....
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