Edit: That Gretsch has the loveliest drone feedback of all of my basses, period. I did get it to feedback eventually by turning my SVT three quarters up and holding it against the fridge 8x10 cap plus resting it on the 18" cab. The bass fought valiantly, but in the end surrendered to the laws of physics and a lovely musical drone ensued that never ever got nasty or squealish, you could always hear a note too. We were towards the end of our U2 cover With or Without You and I could have filled a stadium with that D/A/B Minor/G-drone forever.
