https://providence.craigslist.org/ele/d/cranston-2sd555-nec-npn-audio-output/7922272574.html
2SD555 NEC NPN Audio Output Transistor - electronics - by owner - sale - craigslist
2SD555 NEC TO-3 NPN Power Transistor multiple quantities available. No delivery. NEC 2SD555 NTE87 ECG87 #radioshack
audio outputby ownernecnpn