Seeking Repair Help with Sony 5-305UW

[Findm-Keepm]

Originally Posted by zeno

Not sure on this one but.......
On late '60s Sonys IF transistors legs would rot off.
IIRC they were square shaped with with an angle cut on
one side & had flat pins. They would intermit sometimes.



73 Zeno

2SC403's - replaced a few in my time. They would act up like a bad solder joint - a real fit finding them. The 2SC403A fixed that - used to get them from the early MCM Electronics - they looked like Sony dipped them after molding so they were encapsulated down the leads about a 1/16' or so. They were cheap enough - ~60 cents, so we would swap them out as a call-back prevention.

A little bit of trivia - MCM was named for the three guys that started it in 1978/79 - Mike, Charlie and Mark, IIRC. I found their 1979 Spring Catalog in my late father's stuff - all of FOUR pages! Semis, fuse lamps, grain-of-wheat bulbs, and the ubiquitous 2.5A/1KV diodes, 100/$14. Only 20 or so STK modules listed....