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space_charged · 8th Jul 2019, 4:32 pm

The wireless is very much working, and quite sensitive too.
None of the valves (excluding the ht rec) is a diode. I'm currently thinking its a grid leak detector based on the VR65 pentode. Still possible it's a solid state device and I'll have another look with that in mind.

As to the magic eye valve I've not decided if I'll bother to fit the Russian new one I bought. That needs a small circuit change to work. In the existing one the phosphor in its "low signal" state is lower brightness than the parts illuminated at high signal.

Hmm, you don't think the magic eye could be being used as a detector...? It is used to display the AGC voltage after all!

C

8th Jul 2019, 4:32 pm	#12
space_charged Hexode Join Date: Dec 2014 Location: West Midlands, UK. Posts: 315	Re: Ferguson 204 XL wireless The wireless is very much working, and quite sensitive too. None of the valves (excluding the ht rec) is a diode. I'm currently thinking its a grid leak detector based on the VR65 pentode. Still possible it's a solid state device and I'll have another look with that in mind. As to the magic eye valve I've not decided if I'll bother to fit the Russian new one I bought. That needs a small circuit change to work. In the existing one the phosphor in its "low signal" state is lower brightness than the parts illuminated at high signal. Hmm, you don't think the magic eye could be being used as a detector...? It is used to display the AGC voltage after all! C