Shorting Plugs and Non-shorting Plugs - Wothwhile?


Well, I have a hum that I can't isolate. I've tried all the usual fixes with no luck. I am convinced, however that the problem is interference from some other device (that I can't isolate). I have a bunch of cheap interconnects that I could use for open RCA connectors on my preamp (Tape 1, Tape 2, Tuner, etc.). Is the effort worth it? I certainly don't mind sacrificing a few cheap ICs to the audio gods. If you have an opinion, please weigh in...
licoricepizza
You don't have much to loose by trying, they can reduce noise from a source external to the pre-amp. And have worked for me. But so has a good power conditioner or a dedicated line. You won't harm anything by shorting out inputs. But, unfortunately sometimes 'hum' is intrinsic to the amp or pre-amp itself (have you listened to the amp itself without anything plugged into it?).

Actually, no, I haven't listened to the amp alone. I did,however, listen to the preamp alone (with headphones, and everything else unplugged), and I still got the hum. That, for me anyways, rules everything but the preamp. Believe me when I say I've tried just about everything.
The short answer is it is worth the effort IMO, though don't expect magic.

I had some serious background noise some time ago and tried shorting plugs (home made) to try to solve it. I found it helped very little, though did seem to help some. I also found that my problem appeared to be a cumulative effect of bad ground connection (on my TT), connectors in need of cleaning, IC's that needed to be re-routed, and open connectors on my preamp.
Not for your problem. Try disconnecting cable tv line and ground and see if that makes a difference. Have you tried the preamp headphone combo at another location to see if it's still there? Take it to a friends house that doesn't have a humming system. If it hums there, something internal is defective or a poor design.