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Radio Road Which tuner to get and getting the most from it. Thank God, for the radio! |
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Radio Road Which tuner to get and getting the most from it. Thank God, for the radio! |
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In Reply to: : Dynaco FM3 hum - much reduced! posted by ltman on November 28, 2023 at 17:22:46:
Glad that replacing the rectifier reduced your hum. I would also consider replacing the 'hot to the touch' quad (can) capacitor in the power supply, either with a direct replacement, or preferably I'd follow Cougar's advice and see if SDS Labs (link below) still has any of their FM-3 power supply boards for sale, although he no longer lists them.
There's also a site called Dynaco Designs offering the cap boards, here:
https://dynacodesigns.wordpress.com/fm-3-kits-and-parts/
Also, if you're soldering anyway, you might consider replacing R-11 and R-13 on PC-8 (both 10K @ 2 watt) with 5 watt equivalents. I believe it was the late Bill Thomas who said here on the Asylum:
"On the FM3, one resistor as-supplied is 2-watts, and runs at about 1.9999-> watts. Going to 5 watts is a very good thing."
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Follow Ups
- Yes, the 6V4/EZ80 is the rectifier tube - 1973shovel 12:47:49 11/30/23 (2)
- RE: Yes, the 6V4/EZ80 is the rectifier tube - ltman 20:28:36 12/29/23 (0)
- RE: Yes, the 6V4/EZ80 is the rectifier tube - ltman 12:07:51 12/02/23 (0)
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