From sf_eureka@sbcglobal.net Wed Jun 27 05:07:47 2007
Subject:Pro-3Tm Feedback Problem

Is this a common problem with the Pro-3Tm?
You're supposed to be able to put it on top of your amp.
Well ... it's got a mic inside that is feeding back.

The horn doesn't put out enough power on its own to keep up with a
loud band. But when I run a line out of the mic jack to my amp (using
the unit's internal mic to pick up the spinning horn) I get feedback.

At volumes below the feedback threshold, I mainly hear the lower rotor
sim. When I dial up the mic to get more upper horn, I run into the
feedback problem.

I just changed the pre-amp tube, so that's not it.
I get the feedback if the Pro-3Tm is within 4 feet of the amp. It's
not convenient for me to place it farther away than that.

Has anyone else run into this? Any suggestions?

Thanks much ...