An overlooked fact that I have never seen addressed anywhere, and is what I have come to believe anyway, because of the 6G9 pictures and Fender’s own schematics and layouts is that the first ones had the Bright channel first and the Normal channel second and later the opposite when looking at the amp from the front. My 6G9-B model has the latter. I’m not sure about which models got what, but they definitely had both faceplates set up that way. Check them out. I didn’t notice it until I compared schematics and started looking at actual pictures of the amps closely.

Tip for anyone who has a 6G9 that still has the 6BQ5’s and original transformers in it: only fire it up on a variac, at no more than 100v. Line voltage is higher today (120-125v) than it was when these amps were new (105v-110v). When the amps were new, they tended to burn up tubes, speakers, and the transformers caught on fire. Run at 100v (or even 90v) and you should avoid those fates. They’ll sound better, too!