Hmm. Interesting. When I did it(67/68)I plugged into the "Normal" channel, Volume-4ish, Treble4-5, Bass-10. Neck pup only playing background music for Officer's Club cocktail party. Acoustic piano, drums(mostly brushes)and me(EB-3). Never had a problem, no "Fartiness",sometimes played a little louder but that neck humbucker really rattled the walls. The bass was Navy issue, prolly a 67 but when I got out in Nov.68, I bought one for myself and used it in a couple of different amps 'til I got my '67 TBird in 73. First amp:
View attachment 3051335 one like this, second amp:
View attachment 3051338 this one-since 70! Yes, I've used this shot b4 but it's too heavy to take outside-again-for a better pic