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allan · 6th Oct 2019, 11:22 am

I solved this mystery. A KTW63 or KTZ63 pentode is strapped as a triode with Pin 6 of the IO holder a tie-off point. The circuit is quite interesting as the valve is run at a very low anode current coupled with a very high negative bias to make it work non-linearly.
I've sketched the wiring for interest.
Allan G3PIY

6th Oct 2019, 11:22 am	#53
allan Pentode Join Date: Oct 2005 Location: South coast near Ringwood/Christchurch, Dorset, UK. Posts: 230	Re: Moreton Cheyney I solved this mystery. A KTW63 or KTZ63 pentode is strapped as a triode with Pin 6 of the IO holder a tie-off point. The circuit is quite interesting as the valve is run at a very low anode current coupled with a very high negative bias to make it work non-linearly. I've sketched the wiring for interest. Allan G3PIY Attached Thumbnails