UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Neil Purling · 5th Aug 2006, 10:45 pm

Am I correct in believing that for a regenerative detector one should have a varaiable mu RF pentode? Therefore a EF183 might work.
However I am sticking with a EF39/6K7. I am also going to try making another radio for Long Wave reception.
This new radio will have a coil with more turns; approx 240 in total tapped at 20 turns for the cathode of the EF39.

I was going to try a ECL80 for the audio o/p stage as I have a o/p transformer to suit this valve. I was however going to use only the pentode portion and drive it with a seperate triode, (one half of a 6SN7GT).
The ECL80 is rated at about 1.5W audio o/p, right? Any one any ideas as to what sort of signal level one would have to put on the grid of the pentode to get that o/p?

5th Aug 2006, 10:45 pm	#44
Neil Purling Nonode Join Date: Jul 2005 Location: Hull, East Yorkshire, UK. Posts: 2,085	Re: Regarding home made TRF Am I correct in believing that for a regenerative detector one should have a varaiable mu RF pentode? Therefore a EF183 might work. However I am sticking with a EF39/6K7. I am also going to try making another radio for Long Wave reception. This new radio will have a coil with more turns; approx 240 in total tapped at 20 turns for the cathode of the EF39. I was going to try a ECL80 for the audio o/p stage as I have a o/p transformer to suit this valve. I was however going to use only the pentode portion and drive it with a seperate triode, (one half of a 6SN7GT). The ECL80 is rated at about 1.5W audio o/p, right? Any one any ideas as to what sort of signal level one would have to put on the grid of the pentode to get that o/p?