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Old 30th January 2009, 11:01 PM   #1
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Default Please help ID this RCA transistor

A friend gave me a heat sink from his parts box, and it's got 10 transistors on it.
I was wondering what they were, and if they would be useful, but couldn't find specs online.
They're RCA-branded
#s printed on them: A7 67703 and VA 73253L

Two questions: What are they? Worth keeping?

Thanks
John
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Old 3rd February 2009, 10:29 PM   #2
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Hi Victoriaguy,

Transistors, if they are good, are ALWAYS worth Keeping. I got ten boxes full of stuff WORTH KEEPING. If you collect, want or even appreciate electronics, you know that eventually you'll need this or that. So if you have the space, keep the stuff.

I am tempted to ask you, where did you get these?

I am not surprised you found nothing abouthtese transistors. RCA stuff is difficult to identify sometimes because they printed numbers for other manufacturers.

but if you can measure them using your meter on diode function you can determine what polarity they are and if they are leaky.

cheers
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Old 4th February 2009, 12:25 AM   #3
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Thanks, Gainwire.

I've got way too much stuff that's worth keeping, but a few transistors won't make the situation much worse.

John
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Old 4th February 2009, 05:03 AM   #4
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Uh, by that, do you mean you have too much stuff and you're going to get rid of some of it? Do you have any old ICs, maybe some flat-pack types or Old Motorola RTL logic chips?

just trying...
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Old 4th February 2009, 06:01 AM   #5
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I'm more of a tube guy, actually. Just getting interested in some of that 'new-fangled' transistor stuff lately
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Old 22nd February 2009, 08:45 PM   #6
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Old transistors out of a junk box could be Germanium so you could consider some version of 2N677 with clue from RCA marking.

The 2N677 is PNP and was produced in 4 selections. The plain version was rated breakdown at 30v, the 2N677A at 40v, the 2N677B at 70v, and the 2N677C at 80v. All were 10 watt max at 25įC. The 03 could be a selection code - perhaps gain matching.

All TO3 base with pin 1 base, pin 2 emitter, and collector tied to case.

I'm just guessing here of course but might help when testing.

Good luck.
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Old 22nd February 2009, 09:36 PM   #7
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Thanks, guys.
Playing around with these is 'on the list' of rainy day projects.

Cheers
John
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Old 23rd February 2009, 01:09 PM   #8
wg_ski is offline wg_ski  United States
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Quote:
Originally posted by John Long
Old transistors out of a junk box could be Germanium so you could consider some version of 2N677 with clue from RCA marking.

Seriously doubt it. RCA's 6xxxx were their house numbers for TO-3 cased units - and the 67xxx was way too 'new' to be germanium. Usually these house numbered parts were standard JEDEC (2N) types with special testing/binning. I keep hoping to run across a complete cross reference for all those numbers, but since a lot of that was probably proprietary to their specific customers it may never be released.
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