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Radio Wrangler · 9th Oct 2019, 11:48 am

The pentode cathode is hard decoupled to ground so it would be hard to drive. The pentode grid has a signal freq tuned circuit to ground, so it could be rather low-z at the LO frequency, so also hard to drive.

Stray coupling isn't nice to rely on.

I think there's more missing than just a coupling component.

David

9th Oct 2019, 11:48 am	#4
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,896	Re: ECF82 frequency changer The pentode cathode is hard decoupled to ground so it would be hard to drive. The pentode grid has a signal freq tuned circuit to ground, so it could be rather low-z at the LO frequency, so also hard to drive. Stray coupling isn't nice to rely on. I think there's more missing than just a coupling component. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done