OC72 transistor is almost as pricey as it was 60 years ago. I found one for 12.45€. I added loudspeaker to my crystal receiver 1965. Could be better long-term i

OC72 transistor is almost as pricey as it was 60 years ago. I found one for 12.45€. I added loudspeaker to my crystal receiver 1965. Could be better long-term investment than some shitcoin.