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RFI that affects phono

Posted on September 25, 2012 at 04:11:43

Posts: 18
Location: HKG
Joined: August 8, 2003
My preamplifier has a high gain phono stage capable to handle MC cartridge with output as low as 0.25mv. I can hear the radio transmission about 2-3 feet from the speaker when the volume is at 9 o'clock and no music was playing. It's pretty annoying even though the radio was unheard when music was playing. Is there any method to get rid of the RFI without affecting the sound quality?


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RE: RFI that affects phono, posted on December 18, 2012 at 16:07:02

Posts: 12317
Location: Melbourne
Joined: September 2, 2000
Is the phono cable which you are using (plugged into the onboard, high gain phono stage), shielded?

Is the case of your amplifier earthed (to mains-earth)?




RE: RFI that affects phono, posted on December 20, 2012 at 13:48:30
Bill Way

Posts: 1752
Location: Toms River NJ
Joined: May 28, 2012
December 14, 2012
Do you have an FM antenna nearby? If so, get a ferrite core and put it over the antenna lead as close to the antenna as possible. They come most commonly as split cores to go over coax, but you can also get some designed to go over flat cable.

"Put on your high heeled sneakers. Baby, we''re goin'' out tonight.


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