#1
Alright so I noticed that on some Fender amps there are 2 inputs....does that mean that you could have to insturments on one amp?

Fender FM 212R

Fender '65 Princeton Reverb
Gear:
Epiphone Archtop Dot
Ibanez RG120
Peavey ValveKing 112
Dunlop Crybaby
Boss Distortion Ds-1
MXR Carbon Copy
Rocktron Banshee Talk box
#2
You can, but it sounds like ass.

What many people do with the all-tube amps is jumper the channels.
#3
It could be useful in an instruction environment where a teacher and student take turns but to imgooley's point playing at the same time would sound all that great.

My Valveking has 2 inputs but the second is a toned down Class A type affect. Not sure how it works actually. Different characteristics for sure.

Are you looking for a new amp Drmmrb?