I have the FM3....

Radio Road

Which tuner to get and getting the most from it. Thank God, for the radio!

In Reply to: FM-3 hum is back and question about impedances. posted by ltman on March 9, 2024 at 08:20:43:

I did the PEC upgrade and coupling caps with a few resistors that were in the signal path and out of tolerance. I built the newer power supply cap board for the replacement of the quad cap but haven't done it yet as the the voltages are still in tolerance and no humming so far.

Have you cleaned or replaced the turn on switch? Sometime when a switch has carbon build up it can cause humming in the signal path like you describe.

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Follow Ups Full Thread

Topic - FM-3 hum is back and question about impedances. - ltman 08:20:43 03/09/24 (6)

RE: FM-3 hum is back and question about impedances. - 6bq5 16:19:34 07/16/24 (0)

RE: FM-3 hum is back and question about impedances. - tomservo 17:51:56 05/18/24 (1)

RE: FM-3 hum is back and question about impedances. - ltman 21:16:44 07/11/24 (0)

RE: FM-3 hum is back and question about impedances. - ltman 08:13:42 04/24/24 (0)

I have the FM3.... - Cougar 07:45:41 04/24/24 (1)

RE: I have the FM3.... - ltman 10:21:14 07/12/24 (0)

Follow Ups

I have the FM3.... - Cougar 07:45:41 04/24/24 (1)

RE: I have the FM3.... - ltman 10:21:14 07/12/24 (0)

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