And my Outlaw Model 770 amplifier was weighted down with lead bars! (Or at least, I presume that's the case. How else could it be so heavy?)

It's all coming together. Outlaw uses lead in my Model 770, they make heavy things, and an aircraft carrier is a heavy thing with lead in it.

Brilliant! By Jove, I think we've unmasked this mystery component once and for all!

Jeff