It's great to hear a guitarist do something original with his live solo. Bravo, Ronni! His playing on the first three TNT albums is fantastic. Highly schooled yet quirky, technical as hell but also lots of fun.
The main guitar is a Guitar Work Shop made by Trond Tufte. The guitar to the left i a Kramer and the quarterstepper to the right is a Bernie Hamburger custom made for Tekrø.
Eddie VH was using 9-40 and thin picks. Yngwie used 8-38 on a scalloped fretboard. I used light strings and 2mm picks and did the Frank Gambale sweep thing too...shred fest. Bach and Roll! I never practise anymore...old and retired shredder...lol! I use 9-42 now. If I am in Motley tuning (D)...need a set of 10's. Live...10's.
Kids! Kids! Stop the video at 1:43 and take note. Look how high his strings are from the fretboard. (the action) Ronnie uses thick strings and the strings are far away from the fretboard. You need increadible finger strength to play a guitar set up like this. Stevie Ray Vaughn played with big strings and high action too. (Gary Moore, John Sykes) Big strings? Big sound. You can't duplicate Ronni's tone with super light strings and low action.
I was able to play spanish fly the other day on a cheap takamine acoustic/electric with like 10 yr. old gauge 13 barbwire style strings like .5" off the neck. I do NOT recommend this as the norm though, haha! I hate big gauge and high action. :\ Yngwie and Petrucci and Gilbert and Romeo know what's up. Esp. Yngwie with the 8 high end and 48 low. Light strings, low low action, heavy gauge picks = shredfest 101
The guys you name are among the finest, but they're blues-based and more old school. You simply can't alternate and economy pick and sweep clean and fast with heavy strings high off the fretboard. Look at Buckethead's setup. Besides this is the era of boutique amps where the gear does half the work for you anyway, unfortunately :)