From deke@dekethegeek.com Wed Mar 05 22:42:42 2003
Subject:RE: Speakeasy Hum Reduction

> Let me add to Steve's insightful comments. We had a long discussion
> regarding the hum issue and I mentioned that I hear absolutely no hum
> whatsoever when using the Speakeasy to run my 122. It is DEAD QUIET, no
> noise at all. I am using a new Leslie cable made fresh about 2 years ago
> and that seems to be the magic ingredient. So people - replace your worn
> and cracked vintage Leslie cables with new ones! It makes a
> difference! It is also safer!

More food for thought:

A 122 is a balanced signal Leslie. I assume Steve puts in a good op-amp to
flip the second signal out of phase so it will work properly. Of course a
balanced signal should be quiter, as it "compares" the two signals to
alleviate hum and interference. A 147 on the other hand was built as an all
purpose Leslie, and has unbalanced input.

Also, even if I had a (less hum) 122 in a studio, I would mount a separate
power input on the back panel or the bottom chamber to separate the signal
from the AC. I don't think it would be a bad idea for a gigging Leslie
either. Anyway, there are nine ways to skin a cat... so good luck.

Deke The Geek