At the time, I wasn't smart enough to know the P90 was a great p'up, it just didn't sound right and the Duncan went in. As mentioned, on the pre batwing SG, the p'up screws directly to wood. I went to the Gibson store and got a replacement dogear cover so I wouldn't mess with the original, dremeled it out and basically made a decorative ring for the HB out of it. Looked great, sounded... well I'd have to say that my setup at the time was probably the baddest in town. I roadied for the biggest band in town, the lead guitarist played a '61 or so LP SG (to die for) into a 100W Boogie, into an old Marshall 4x12, and he said that his setup would blow mine away...
He came over to pick up a snake I'd gone through and resoldered, and I was like "Hey John, listen to this and tell if you think your amp still blows mine away". Previously mentioned SG Jr. into small box 50W Plexi "owned by the guy in Black Oak Arkansas" according to Westbury in NY who handled Marshall at that time, into a 60's and rare Marshall 8x10 cab with metal handles. I barely got through a salvo of A D A G D A chords, and he ran (he ran so far away... ;-), literally, ran out of the house. Outside, he says "that's fng insanely loud... it is louder than the Boogie"
Those guys did an AC/DC show that was just so killer (all pre 1980 songs) and he knew loud. They were so loud you could hear them rehearsing for blocks, in fact, that's how I met them. Riding my bicycle home one night, I heard a rendition of Touch too Much that was like listening to the record but better, found them rehearsing in an old gym, ended up working with them for years, had my own band with the drum roadie, his cousin was Chris De Garmo from Queensryche, and he was so freakin loud... that I took the 50W Plexi to the music store and traded it for a 100W Sound City, and they made me give them cash to boot... probably my dumbest gear move ever.
In all fairness to the P90, Townshend's tone on Live at Leeds is probably as good as it get, especially the way it cleans up.
Interesting story about Martin Barre, he didn't want the gig with Tull, too much competition... He auditioned, but didn't get the gig on account of a Gibson 330 that squealed like a pig... Tony Iomni (This is Birmingham) got the gig, "but didn't work out" lolol...
So Barre got a second audition, but this time with a buddy's old LP Jr. and got the gig.
Then he got his own LP Jr. and the rest is history.
On Aqualung, it was the Jr. straight into the Marshall. Reverb etc were added later.
For a few years after, he played a Les Paul Standard, as seen here.
https://www.youtube.com/watch?v=UCMS-NJ7VxU
I love this band.