mijknahs wrote:Another thing to consider is the slight breakup of the JBL E120s when they get pushed to *their* limit. Jerry was know to blow them more often than most of us ever will (I've never blown one in the 15 years I've been using them). I've seen Parish change a few out. A 50W Mac isn't going to breakup the JBLs like a 300W Mac will. Then there's the volume of the Twin preamp as well. It sounds totally different at 3 or 4 than it does at 7 or 8. (again -gotta check out that JGB 5/31/83 Rhapsody in Red opener. Talk about pushin it!)
you touch on actully two factors that WERE different from each other in the 70's vs. the 80's. the JBL K120's were used up until at least the closing of winterland, dec 78. a 3 k120 speaker cab would only be rated for 300watts and more apt to blow at clean pushed levels. so quite possible the volume was more tamed in the auditorium setting. 3 e120's would have a rating of 450 watts and leave much more room to push before breakup, however a good whack of the mutron 3, octave divider or both can trash those k & E's. i think that's how he blew the e-120's when he used those vs. being able to do the same or blow the K120's in a clean environment. it's most likely why he made the move to the e120 from the k120, more headroom.
the second factor is the twin pre's volume setting, with a blaster onboard wolf from the late fall of 77 set at roughly 10Db's up until tiger arrives, would cause him to keep the twin pre's volume much lower then when he played tiger which was slightly less then unity. a blaster set at the level jerry needed to even out the effects cabling, makes for a super hot guitar, but is tameabale by lowering the twin's preamp. so the my guess is the twins pre was more in the lower range of volume while the opamp buffer twin preamp volume was a lot hotter.
my point is, while it is the same mc2300 and twin preamp through these years, they definately are not the same setup's or volume settings once you throw the speaker ratings and buffers used into the circuit alone.