Folks, I dismantled this silver puppy. And here is what we found! The
RF board dated 2004.4.15 . TWO PVC tuning capacitors. PVC1 has 4
built-in trimmers,PVC2 got none . PVC2 appears to contain more plates.
IC1 is TA7358AP. Circuitry is indeed purely LC based analogue- there is
not a single crystal in the oscillator/mixer area . So, if the variable
capacitors are using pvc as an insulator I can imagine that would
partially explain such wild frequency drift due to temperature changes
How stable is TA7358AP?