Nice B25B, it's in great condition!
I'm curious though, I've seen those "jumpers" (for lack of a better term) that look like they're going between channel 1 and 2 inputs? I don't quite get what the purpose is. When you do that, I assume you plug your bass into one of the other inputs as well?
I can't do it on my V4B since it doesn't have all those inputs, I was just wondering what the purpose is. Call it "for future reference" since I know I'm not done questing with tube amps. lol
Thanks in advance!
5sg.

My basses are: Sandberg classic P and Ibanez artcore AFB-200BS.