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PJL · 30th Nov 2022, 8:33 pm

If it definitely occurs on AM it is not the FM front-end as the HT for this is switched off in AM.

When you tested it on gram and it did not rustle did you put the link in the gram position (short the radio output)? It might be worth confirming no rustle for gram in both AM and FM positions and with/without the radio short link.

HT tracking in the waveband switch has already been mentioned as a possible cause. HT is on S1 and S4 and the only way to check this is to disconnect the HT from these and hard wire for FM.

30th Nov 2022, 8:33 pm	#11
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Cossor 524 rustling noise on FM If it definitely occurs on AM it is not the FM front-end as the HT for this is switched off in AM. When you tested it on gram and it did not rustle did you put the link in the gram position (short the radio output)? It might be worth confirming no rustle for gram in both AM and FM positions and with/without the radio short link. HT tracking in the waveband switch has already been mentioned as a possible cause. HT is on S1 and S4 and the only way to check this is to disconnect the HT from these and hard wire for FM.