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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Re: triode EL34 and true triodes posted by Richard CWY on August 13, 2002 at 19:53:56:
Hi,Pardon me for popping in.
In a pentode most of the performance is determined by cathode, control grid and screen grid. It is the voltage at screen grid that gives ampl. factor and current for a given voltage at control grid.
One may vary the plate voltage quite a lot without having any significant difference in performance (known as high internal resistance).
So when using tetrodes, beam tetrodes or pentodes it is the DC supply for the screen grid that is the important part. [If one looks inside an radio set the output pentode most often has a very raw DC supply for the anode, but more filtered for the screen. And so quite little hum though the PSU is basic or less.] Good news is that screen grid draws little current and so are easy and cheap to filter well (YMMV).mvh /Pär
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Follow Ups
- Re: triode EL34 and true triodes - Pär 22:27:57 08/13/02 (3)
- Re: triode EL34 and true triodes - Eli Duttman 01:48:31 08/14/02 (0)
- Re: agree on screen supply - Oscillatus 00:39:24 08/14/02 (1)
- Re: agree on screen supply - Pär 00:42:20 08/14/02 (0)
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