I know of a running TRS80 and a BBC Model-B, but the retro-heads who own them jst pwer them up now and then, not in constant use so as not to heat-stress them.

I know of a running TRS80 and a BBC Model-B, but the retro-heads who own them jst pwer them up now and then, not in constant use so as not to heat-stress them. TBH they smell a bit. My theory is the transformer windings are on the way out.