To: | <amps@contesting.com> |
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Subject: | Re: [Amps] Looking for a design for a single 4cx250b tube on50Mhz-SixMeters |
From: | Steve Thompson <g8gsq@ic24.net> |
Date: | Tue, 12 Oct 2004 17:53:25 +0100 |
List-post: | <mailto:amps@contesting.com> |
On Tuesday 12 October 2004 17:29, Karl-Arne Markström wrote: > I agree, the tuned circuits in this amplifier do look not very optimised... I usually use a series tuned circuit at the input, with a variable capacitor onto the grid to adjust the coupling. That's based on a suggestion I saw that the parallel circuit has the risk of a spurious vhf/uhf resonance between the grid capacitance and the inductor, which is something to consider when the tube has useful gain to 500MHz and beyond. Maybe it's a false premise, but I've not had any problems. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps |
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