Post
by vh junkie » Fri Mar 13, 2015 6:31 am
Has anyone had luck using effect(s) in the loop WHEN driving the PS with a dimed (all controls on 10) 100w plexi?
Mine works fine without anything in the FX loop... but once I put anything in the loop the squealing begins...
I can get rid of it by turning down (to 6 or below) the Presence, Middle and Treble on the amp... kind of defeats the whole EVH tone thing! Luckily, the controls (Depth, Presence, etal) on the front of the PS can be used to bring the sound back to something close to desirable.
YES... I am using an FX device that has input and output level controls... it does not matter where the levels are! My impression is that something about having the FX in the PS loop is reflecting a different (frequency related) impedance back to the power section of the amplifier. The problem probably would not exist when using a OT with a more even bandwidth, but of course this not the case with plexi OTs. I will open one of the amps this weekend, and try some techniques to to add more stability to the output section, and see if that helps.
"With all due respect, sir, you're beginning to bore the hell out of me."
- Gunny Highway