#1
ok i have a little 12w or 15w amp as well as my 75w amp. i tried using both together today by plugging my guitar into my my small amp, out the headphone jack and into the other amp.

it worked alright for 10minutes untill the small amp stopped, the light was still on but there was no sound. i unplugged it and tried it by itself but it didnt work.

i took it apart and checked the fuse and it seems to be intact.

is there anything else i can check to try and fix this cause i like my little amp because its portable.
#2
first of all, why did you plugged your small amp into you big amp?
A hero of war, Yeah that's what I'll be

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#3
The headphone out signal was probably stronger than the guitar-level input on the other amp could handle. I guess it might be repairable, but it'll be difficult and/or expensive.
#4
i wanted to see what sounds i could get out of using both together, like with the over drive and such