I am currently using my Quad 405-2 independently of a Quad pre-amp with power 'pass-through' and switch facility.
Only problem I am encountering is an occasional nasty spike in the speakers at switch on.
I am considering fitting a RIFA suppressor (as used in the 33 and 34 pre's) across the 405-2 power switch.
My questions are:
1. will it make a difference?
2. is it safe?
3. should it go after or before the switch?