Thanks Chad, we have the same observation regarding tolerance specs of this old radio. I wonder what if we add more parts; regulators..etc.. to this old circuit and make it better?..You see i have four high-end Amps, two of them almost the same model except for the price. The reason?..they claim it's basically the same circuit but the magic, they say is the 2% tolerances of the caps and resistors being used inside.....and believe me it sounds better, the reason why i bought it...
I did a research about these low tolerance parts and they actually exist and very expensive;..$2.80 for one (1/2W) resistor, whew!....So what drives these people to produce such exactness?? ...I figured very few could understand the quest for improvement... and probably should not talk about it here.