In the era of the muffin (box) fan there are no excuses for even the poorest venitlated designs to run cool. Modern computers are a testitment to that bit of clever engineering. But 40 years ago I think the mentality to heat and MTBF (mean time before failure) was very different. I'm sure back then manufactures were well acquainted with the idea that heat kills. But to use a small fan to force out the heat, well that would mean the TV set would last longer? I recall there were some tube portable sets in the late 1960's early '70's that did have a small quiet 3 fan inch moulded into the back plastic cover. I think they were made by Toshiba for sears. I suppose plastic cases would melt down much easier than the thermo plastics made for TV sets today. Then again, let the heat kill the set...in an ear when new models are sold every year...TV sets are like cars...run then for a while then replace them. I guess Philco thought a bit of heat was good for repeat business!
