I've only ever seen rubber disc padding to the chassis or shaped-top clamp
to torroids. Amplifier smells smokey when run hard. This Tx is 650W and the
smokey smell is only when the amp is run hard. Amp had a ventillation
problem so could easily have generally overheated including the Tx, no
mention of internal fuse on the Tx label, but has full V and A ratings and
name etc , otherwise. The nut to the coachbolt was slack because this foam
had compressed.
I needed to warm up the foam to remove cleanly as intentional sticky-back
glued to the tape binding of the toroid, the central hole for the bolt (not
stuck down in that area as the epoxy core is recessed) was oval but
otherwise I would not say it looked/felt overheated. This foam , and only
the foam. smells of that distinct tarry smell that lingers around burnt-out
buildings for months. Anyone come across such foam used in potentially hot
circumstances and noticed this smell . There is not the slightest trace of
smoke emenating through the gaps of the Tx winding tape or high magnetising
current from shorted turns of the Tx .
I think its that ordinary black foam with sticky backing that is used to
keep wiring looms etc in place in chassis .