Old transistor identification

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Posted on September 21, 2009 at 09:40:23

bevo
Audiophile

Posts: 307
Joined: December 27, 2004

I have a set of old TO-3 transistors pulled from an old HarmanKardon unit. They are labeled SDT-9261 and - what I assume is the date code of 6741. Best I can tell from my measurements, these appear to be NPN with gain ranging from 7 - 17. The HK unit was a low power receiver/turntable combo unit. The manufacturer marking is a capital "S" in a vertical rectangle (STMicroelectronics maybe??) There are also 2 other TO-3's that are fairly pitted on the outside and are hard to read, but I think they are labeled 86 5043 2, then below that VFS2745K. No manufacturer marking is apparent. Any ideas? Thanks.

RE: Old transistor identification

llwhtt

20:03:26 10/27/09

RE: Old transistor identification, posted on October 27, 2009 at 20:03:26
llwhtt Audiophile Posts: 26 Location: SOCAL Joined: October 28, 2008	The "S" is probably Solitron, they still use the same symbol today. Whether they have any info I don't know, maybe an email is in order. Craig

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Old transistor identification

71.204.54.207