I own some guitars,a bass guitar, a banjo, a bodhran, a banjo, a ukulele, a melodeon, and an amplifier (the devils little helper).

Not too far off what I own. 2 acoustic guitars (one needs repair though), electric 5 string bass, tenor banjo, mandolin, octave mandolin/mandola, G/D melodeon, B/C button accordion (not got my head round playing that).

A small amplifier was used by one of the people in an Irish session I go to. He seems to have cured whatever the problem was with his (Hathway - it's a nice instrument) mandola now but for some reason, for some time he was struggling to get volume out of it. For his purpose of getting his sound level in line with the others in the room, I thought it worked quite well.