I've bought a Peavey Vypyr 30 and my band have begun to use my place for practice for a first time in a while. The amp has 1 jack input but also a mini jack, so my question is could I use one guitar in the input and then have an amp head plugged into the aux cable and have the two guitars hearable.
Maybe, but it'll sound awful and probably damage the vypyr's speaker
Peavey 6505+
Fender Hot Rod Deville 410
Fender Telecaster Blacktop
Gretsch G5120
If the other head has a headphone/line out you can use, and works without a speaker attached (most do not) this will work. However, expect to find that the two guitars kinda get lost in a mush together.