2. analog
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Remove Radio Station Background Noise

What is the best way to remove radio station sound from the TT feed to the pre amp? 

When I turn the volume up to about 50% I can hear radio station noise if my ear is next to the speaker.

I started using clamp-on ferrite chokes that clip around the cables from the TT to the phono preamp to eliminate the noise.  I wanted to know if there is a better solution or if the ferrite chokes compromise the sound.

 

The TT is a VPI Classic 3. The phono preamp is a Sutherland PhonoBlock and the pre amp (DMC-30SV) and amps (DMA-400) are Spectral Audio.  All cables are MIT Oracle MA-X. 

bigby
holmz's avatar
holmz
2,328 posts
 

It is either coming in through the TT or the amp/pre.

People talk about RF and power conditioner non-stop, but I have never seen it make a difference, but an aesthetic hermit doesn’t get out much.

If it is only on the TT, then the shielded cable (as @erik_squires mentioned) would be the place to start. If is coming on other sources then it is more common (like power, ground,???)

Start with the TT to Phono, as that is where you have both low signal as well as all the phono gain comes in right after it.

clearthink
1,421 posts
 

Good advice from @erik_squires about shielding also you want to keep the phono preamp near the TT and the cable between the two as short as possible. Are you sure all connections are tight, especially at the cartridge pins.

fuzztone's avatar
fuzztone
5,624 posts
 

Sounds like a LOMC to me.

bobsdevices
100 posts
 

Yes, you need EFI/RFI shielded cables.  2 twisted internal conductors covered by a shield (an aluminum foil covering then braided wire over the aluminum). Connect the shield to the - side of the RCA at the source end only and leave the other end disconnected.

vinylvin
146 posts
 

Try cleaning your RCAs.

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