protecting my amp and preamp from my electronics

[effbiae]

hi,

i've searched for "limiters" and "protection" and i can't find answers...

before i plug anything into my amp, i want to make sure i don't blow it up (the amp, that is).
also, i 'll be plugging in to my separate preamp where i will need protection, too.

first, is it necessary?  can i blow my equipment with a 9v battery? how about a 12v battery... or even 2x9v battery?  what about a wall-wart which might produce more current?

can anyone point me to simple schematics for this, or are they complex things?  i don't have any FETs and the shops have closed this evening...

kind regards,


jack

[gez]

Firstly, you need to find out what the input stage of your amp is.  Valve?  Transistor?  Chip?  If it needs protecting, Geofex is your next port of call. 

Edit:

http://www.geofex.com/circuits/when_good_opamps_go_bad.htm

Plenty of posts by RG on all this (one recently on how much valve input stages can take).