Non top-cap tubes for plasma tweeters - diyAudio
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Old 9th November 2008, 05:28 PM   #1
bigwill is offline bigwill  United Kingdom
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Default Non top-cap tubes for plasma tweeters

Is it possible to use a tube without a top-cap anode to make a plasma tweeter with?
(Such as the one described at http://www.plasmatweeter.de/eng_plasma.htm )

The GU-50 is a cheap powerful RF pentode without a top cap, and since the tweeters are basically big RF generators, will it work, or will the plasma arc straight to the other pins or interfere with the modulation drive? Surely an actual RF transmitter works in a similar way so it shouldn't be a problem, right?
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Old 9th November 2008, 06:12 PM   #2
nhuwar is offline nhuwar  United States
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Don't see any reason why you couldn't, just need a few extra windings on the secondary. After all these things are basically tesla coils.


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Old 9th November 2008, 06:15 PM   #3
nhuwar is offline nhuwar  United States
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After comparing the specs of a gu-50 to a pl519 I'd say a definite yes on the the use of a gu50 for this application.


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Old 9th November 2008, 06:18 PM   #4
bigwill is offline bigwill  United Kingdom
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Thanks for your reply

The GU-50 does indeed sound ideal for this application - my biggest worry is the plasma somehow getting on the tube socket pins and vaporising solder - I don't want to breath in lead fumes!
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Old 9th November 2008, 06:34 PM   #5
nhuwar is offline nhuwar  United States
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Ya I don't think you should have to worry about that. And if that happened the tube wouldn't last to long anyways. Your looking at 3 to 4 thousand degrees F for that plasma so it would also make short work of the tubes envelope and bring it to atmospheric.


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Old 10th July 2010, 08:12 AM   #6
okk is offline okk  China
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As a plasma tweeter, the voltage at anode not so much high.
Don't worry about the problem between pins.

By the way, did your GU-50 work OK?
Recently, the PL519 expansive too much, GU-50 is a good idea.
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Old 10th July 2010, 03:01 PM   #7
bigwill is offline bigwill  United Kingdom
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Sadly I never got around to it! I really ought to have a go, it's such a simple circuit!
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