I would guess the PR-330 to be built in the late 50's to early 60's. Tubes used in the AM tuner section were of that era; 6BE6, 6BA6, etc. It is un-restored in original condition with the infamous ceramic cased oil capacitors still in place. I don't plan to use it or upgrade the capacitors until I find the matching power amp that it is powered from. I did however, make an adapter that would let me power it from one of my Heathkit tube amps if I ever get the urge to hear it play.The serial numbers on the early stuff typically don't follow the format that came later but do look something like what you have there. We will assume that's the serial number until we know more. This will be the first one on file. Would you say it was built in the early 1960's?
- Pete