[Arran]

I don't think there are many issues with the Models 80 and 81 sound wise, they are probably a little deaf in the front end but the audio output stage is basically the same as a model 60, a #42 power output, and a #75 first audio. They were entry level models, there is some debate over whether they were a loss leader for Philco to get people into the showroom, but I doubt this given how many they built, and they were obviously good enough for most purchasers otherwise they would be much rarer today.
Regards
Arran