VPI Scout Hum

Some VPI's use unshielded cables from the back of the tone arm to the the interconnect box. If your cartridge is a high output, that means it is high impedance, and unsheilded wires are a big problem. (Not so with Low output MC;s - the low impedance system tends to inherently be insentive to AC fields) Also - Someone on this thread mentioned the possible use of UNSHIELDED RCA cables - NO - NO - NO. THeya re very correct. VERY WRONG to use such. You cannot use such for low level signals of ANY kind. Thats why cheap shielded cables helped.

SO.....

1) Get sheilded cables for your RCA's from table to Preamp if you are using flat unshielded cables.
2) Move ALL ac cables away from the rear of the VPI if the tone arm exit cable is unshileded (you can see colors instead of silver shield wire). IF YOU TOUCH THIS WIRE and the hum gets worse, THATS your problem. TO fix that:
3) Wind some VERY soft VERY THIN single strand copper wire (take it from an old AC cord or speaker wire)in a sort of tight spiral (with gaps) wrap around the UNSHIELDED tone arm wire with the loose, long end near the arm wire jack. THEN, do it again but wind the opposite direction. Again the free end should be near the jack. Twist the loose ends together. Connect them to the GROUND LUG on the VPI box. Of course run a ground from this lug to your preamp.

Hum gone.

Peter Ledermann/President/Soundsmith

Peter,
Thank you so much for your input! It's greatly appreciated. I hope you're healthy and feeling great.

I'm using your Aida MI cart in Ebony on my Scout with your MMP3 phono stage and I love it. I too experienced some hum, but it decreased after I replaced my Kimber Sliver Streak with a cheap, well-shielded interconnect from Radio Shack from the Scout to the phono preamp. (I'm running the Silver Streak from the phono to my main amp now.) One question I have to clarify: how do you tell if the tonearm wire is unshielded? If you see just silver, it means it's unshielded, and if it has colors, that's the shielding, right? It appears my Scout has a silver wire with a colored wires twisted together. Would the copper wire trick help with the hum further? Thank you.

If the lead out wire from the rear of the tone arm is twisted COLORED wires, its unsheilded. Then you need to do my trick with the copper wire to make it a bit shielded. If it is silver colored, it is shileded. Nothing to do. Our cartridges are six sided magnetic shielded, so they dont hum at all.

Bear in mind that cheap Radio Shack cables are likely NOT well shielded, so you may want to go for some reasonable cables. The STRESS here is on the word REASONABLE - Dont go nuts with cables. Good shileded cables are fine - leave some funds left to buy some shoes for the children with the money you save.

Your flat cable from your Soundsmith preamp can still creat some hum, so try routing it away from AC fields as you listen.... or replace it with shielded types.

You should NOT have any hum AT ALL with our cartridges if all is well with your cables....and the possible VPI mod.

Peter Ledermann/Soundsmith

Great advice. Thank you Peter.

VPI has its own cables...they probably work....