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bill knox · 21st Aug 2019, 8:36 pm

Hi Turretslug

I did think about IF breakthrough and so I removed the 2 IF amplifiers and it made no difference I then also removed detector/AVC valve an EBF80 and that made no difference either, that is why I came back to AF instability in the audio stage, as I said I have put a .01uF across the primary winding and that has put paid to about 95% of the problem, I just wondered if there may be an optimum value of capacitor that would do a better job

Bill

21st Aug 2019, 8:36 pm	#10
bill knox Hexode Join Date: Mar 2011 Location: Wilstead, Bedfordshire, UK. Posts: 367	Re: Chapman radio Hi Turretslug I did think about IF breakthrough and so I removed the 2 IF amplifiers and it made no difference I then also removed detector/AVC valve an EBF80 and that made no difference either, that is why I came back to AF instability in the audio stage, as I said I have put a .01uF across the primary winding and that has put paid to about 95% of the problem, I just wondered if there may be an optimum value of capacitor that would do a better job Bill