Plasma Tweeter Questions - 813 possable? - diyAudio
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Old 16th June 2008, 06:40 AM   #1
diyAudio Member
Join Date: Aug 2007
Default Plasma Tweeter Questions - 813 possable?

I want to know if I can use an 813 for the plasma tweeter? I thought a el34 (triode connected) > 813.
I have seen this:
using a 4/400a.
If using an 813 is possible, what operating conditions should I go for? i.e., cathode modulation? fixed grid bias? what anode voltage? And what driver/coupling should I try?
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Old 16th June 2008, 07:20 AM   #2
diyAudio Member
Join Date: Jan 2005
Location: Berlin
Hi toshiba_nz,
did you read this:
it might interest you too.
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Old 16th June 2008, 07:27 AM   #3
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Join Date: Aug 2007
Hi Frank, Yea, thanks. I read it where I could. ( Pleanty of fancy pictures, but not really many clear details in english.)
Why does he use 2 electrodes? one silver, one tungsten? And, why does he diss this guy?
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Old 19th June 2008, 04:38 PM   #4
expert in tautology
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Join Date: Apr 2002
Location: New York State USA
Please be sure to place your plasma tweeter *inside* a shielded, grounded enclosure.

A tube like a 4-400 or an 813 is capable of significant RF output.
ANY RF beyond 100mw IS ABSOLUTELY ILLEGAL IN ALMOST EVERY COUNTRY IN THE WORLD. Plus you can interfere with all sorts of other communication and services at distances exceeding 1,000 miles away from you!!

The output of a plasma frequency is HIGH in RF Intermodulation products. Your output is NOT just on one single frequency!!


_-_-bear -- Btw, I don't actually know anything, FYI -- every once in a while I say something that makes sense... ]
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