To: | wlfuqu00@uky.edu |
---|---|
Subject: | Re: [Amps] 4-1000A in Passive grid-driven use? |
From: | R.Measures <r@somis.org> |
Date: | Fri, 30 Apr 2004 08:01:06 -0700 |
List-post: | <mailto:amps@contesting.com> |
On Apr 30, 2004, at 6:32 AM, Bill L. Fuqua wrote:
ï AB1 means there is zero grid-current. AB2 means there is some grid-current. and the plate RF current would be the same as the drive RF current and the power gain would come from the ratio of cathode drive impedance and plate impedance. If the plate impedance was 5000 ohms and drive impedance 200 ohms then the power gain would be 25 or so. ï Since there is zero signal potential applied between the grid and the cathode, the power gain of a Class AB1 / "super cathode driven"stage is roughly the grid-screen amplification factor -- which is typically 4 to 6 in most tetrodes. It would be interesting to try. I expect that the cahtode impedance would be somewhere between 100 and 200 ohms. It should be somewhat greater that gg due to the greately reduced grid current. ï Agreed, Bill. cheerz Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps |
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