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Neil Purling · 17th Nov 2017, 7:17 pm

I am doing a deal on a Champion 784 chassis & I have one of those kit TRF's. The kit radio is case-less & anonymous
I will have to see which would do best. The kit radio has a 6J7 as detector & 6V6 o/p. At present I would need to see about mounting a IF can. I wonder if the aerial coil of the TRF will serve with a specific oscillator coil? I do have a MW aerial coil. Re-wire the base of V1 to use a ECH35. If it works, OK. If not plate over the hole to fit an B9a base & ECH81.
I do remember that when I tried a Superhet before I had a variable capacitor with 2 equal gangs & it took a 1000pf trimmer across the osc coil to get the necessary off-set. Not sure whether there's the room to mount a coilpack under the chassis.

17th Nov 2017, 7:17 pm	#23
Neil Purling Nonode Join Date: Jul 2005 Location: Hull, East Yorkshire, UK. Posts: 2,087	Re: Most Minimal Superhet I am doing a deal on a Champion 784 chassis & I have one of those kit TRF's. The kit radio is case-less & anonymous I will have to see which would do best. The kit radio has a 6J7 as detector & 6V6 o/p. At present I would need to see about mounting a IF can. I wonder if the aerial coil of the TRF will serve with a specific oscillator coil? I do have a MW aerial coil. Re-wire the base of V1 to use a ECH35. If it works, OK. If not plate over the hole to fit an B9a base & ECH81. I do remember that when I tried a Superhet before I had a variable capacitor with 2 equal gangs & it took a 1000pf trimmer across the osc coil to get the necessary off-set. Not sure whether there's the room to mount a coilpack under the chassis.