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

PJL · 30th Sep 2021, 5:38 pm

I would not expect AM and FM to suffer the same distortion cause unless it is in the audio section. What types of capacitors are in this set as it's quite 'modern' so they may not be paper. To get FM working properly you do need to replace C49 (trader) and C50 if it is paper.
Not sure what your siggen is but if it's a basic valve model it would be worth scoping the output of the generator as they are not precision instruments.

30th Sep 2021, 5:38 pm	#24
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Philips 543A problem detector stage I would not expect AM and FM to suffer the same distortion cause unless it is in the audio section. What types of capacitors are in this set as it's quite 'modern' so they may not be paper. To get FM working properly you do need to replace C49 (trader) and C50 if it is paper. Not sure what your siggen is but if it's a basic valve model it would be worth scoping the output of the generator as they are not precision instruments.