High Power Tubes [message #8192] |
Tue, 25 May 2004 02:25 |
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Wayne Parham
Messages: 18792 Registered: January 2001
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Illuminati (33rd Degree) |
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Ever seen one of these transmitter tubes?
I found this link to Econco in one of the Google ads. Pretty interesting. Look at this military tube:
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Re: High Power Tubes [message #8195 is a reply to message #8192] |
Wed, 26 May 2004 00:07 |
metasonix
Messages: 103 Registered: May 2009
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Viscount |
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The upper photo is a TH347. Often seen in VHF-TV transmitters I believe. Lower looks like a water-cooled type for industrial RF heating use, not military.Econco's sales engineer is George Badger, who used to be president of Svetlana USA. I have contact info if you want to ask him questions about transmitting tubes. He worked at EIMAC for 40 years, making him one of the world's leading experts.
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Re: High Power Tubes [message #8202 is a reply to message #8197] |
Thu, 27 May 2004 21:01 |
metasonix
Messages: 103 Registered: May 2009
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Viscount |
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1. Most of them are medium-mu or high-mu triodes, or else tetrodes with very high transconductance. This tends to result in poor linearity. Tetrodes are usually ok if operated push-pull.2. We are talking about power supplies of 5-20 kV at 1 amp or more. Filaments need scores or hundreds of amps. The power transformers end up weighing 200 lbs or more... 3. The output transformer will be huge, and VERY costly to make. 4. Large blowers for forced-air cooling, or else water connections for water cooling (and big water bills), are mandatory. Other than that, they make great audio tubes.
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Re: High Power Tubes [message #8205 is a reply to message #8202] |
Wed, 02 June 2004 17:17 |
TC
Messages: 41 Registered: May 2009
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Baron |
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>>. This tends to result in poor linearity. ==Your honor, the witness is leading the jury without substantiation. >>4. Large blowers for forced-air cooling, or else water connections for water cooling (and big water bills), are mandatory. ==Oh behave. >>Other than that, they make great audio tubes. ==my oh my... TC
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