[psyco1]

I did a search on this, but not too much came up.

Tube amps have a lot of high voltage running around inside and higher voltages mean a larger inductance field around the components and wires carrying it. Now, couldn't that cause some interference between them? And if so, wouldn't shielded wires or cables reduce that?

 

[Tomo]

Hey,

Your logic isn't ... correct. Tube amp hum is caused by multitude of things. It could be anything. Tranny humming, RF pickup, Noisy line, Noisy filament PSU, etc etc. It is sooooooo much like voodoo. Many say that they have to fiddle with wire placing until hum goes away.

Using shielded cable may solve only one of multitude of problems.

What I do with shielded cable is to use it before the amplifier. Many amps have very high input impedance however cable that feeds signal has very low impedance. I sometimes use shielded cable here to prevent pickup. When you hear about above situation, you should always remember that RF pickup will likely to occur.

Tomo