Radio Road

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

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Original Message

Dynaco FM3 hum

Posted by ltman on November 26, 2023 at 12:23:19:
So it turns out after about 15-20 minutes a minor hum develops in my FM3. The big 40/40/20/20 can does get pretty warm, almost hot. I am thinking this is likely a contributor if not 100% cause of the hum.

Prior to the 15/20 minutes use, the FM3 is dead quiet, no hum or hiss.

I have a replacement on the way from Antique Audio. Due to aging and heat exposure I presume all the boards, traces, and solder joints are very fragile.

Two questions:

1: Any tricks to minimize causing new problems in the boards while R&Ring components?

2: Since I had the tuner powered up for a couple hours recently, I need to be concerned about the caps holding a charge after power was disconnected. Could I be sure they are discharged by switching the unit on with a load without being powered up? I do have a "snuffer stick" but I worry I could miss a cap and I am not very experienced reading schematics...

Any other tips to R&Ring components for this unit?