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G8HQP Dave · 6th Jan 2011, 4:46 pm

The EC92 RF stage will need its grid to be tightly decoupled to ground, otherwise it will at best have no gain and at worst will oscillate. The cathode will have low impedance so the input circuit may need to be series tuned, not parallel as you have it.

6th Jan 2011, 4:46 pm	#31
G8HQP Dave Rest in Peace Join Date: Sep 2008 Location: Solihull, West Midlands, UK. Posts: 4,872	Re: building a tube ghetto blaster The EC92 RF stage will need its grid to be tightly decoupled to ground, otherwise it will at best have no gain and at worst will oscillate. The cathode will have low impedance so the input circuit may need to be series tuned, not parallel as you have it.