jenkins wrote:What exactly is the black mystery knob on jerry's amp? Do you guys have pictures of it?
If I had the perfect custom amp it would be a twin modded exactly like jerry's except it would have a knob on it to mix the two channels so i would have exact control over how much wet and dry tones are in the mix.
I think its a channel blending knob but thats strictly a theory, what do u guys think?
Does anyone know if he used both channels into the 80's? I think he must have and that icepick tone that came along in the 90's was due in part to the fact that he was only using one channel at that point.
According to Dennis Leonard via Waldo:
"Only one channel was used, the other amp was a spare, the knob was to switch to tuner..."
The only time Jerry blended wet and dry with the Twin was in '74... when the twin(s) returned in '76, just the Blackface Vibrato channel was used.... Spring '77, Jerry jumpered the vibrato channel of the Black via Input 2 to Input 1 of the Silverface and used both Twins to drive either side of the Mac... one side had 2 2x12' and the other had a single 4x12.
Summer '77 sees him switch back to just the Blackface, which he stuck with until around '82... Then it was primarily the Silverface vibrato channel driving one side of the Mac, until the switch to the GT Trio... Which was when the thin ice pick tone started, since the Mac and the speaker cab were no longer used onstage. The ice pick tone had nothing to do with the Twins and it doesn't appear that Jerry jumpered the Twins in any configuration after Spring '77.