Re: That Howl though!
"Would the young gentleman like a red spot or a white spot?"
I remember buying the tiny Red Spot and Blue Spot transistors individually as a teenage hobbyist (in UK). By appearance they seemed to have been produced by BTH (British Thomson Houston), evidently screened-out rejects from the production line.
Red Spot for Audio, Blue for frequencies up to RF like your MF superhet oscillator/mixer stage. Performance very much a lottery.
I had one that self-combusted from thermal runaway due to high internal leakage current. This was the days of germanium, before silicon.