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tinkerbell 27th April 2005 12:30 PM

fairchild find?
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hi, i just found these little black boxes full of semi's that i remember buying at a yard sale when i was a kid - mostly because i think they "looked expensive"

anyways, in each box there are:

1 x AY9171
1 x AY8171
1 x 2N3638A
1 x 2N3643
1 x SE4010
1 x 2N4250
1 x 2N3565

and i have two matching boxes...

the base of the box states that the AY9171 is PNP and the AY8171 is NPN and they are rated at 35W Max. Power T.C 25'C

basically - what can i do with these?

i assume it woudl make a great stereo 35W amplifier module, but i have no schematic, nor do i know how to create one?

any advice woudl be good,

if they are junk - i will forget about it, but if they are not 'junk', it could be a worthwhile project?

attached is pic

tinkerbell 27th April 2005 01:04 PM

BTW - the 'AY' transistors are smaller sized T066 packages...

jackinnj 27th April 2005 01:15 PM

these would appear to date from the early days of Fairchild -- before the group left to form National Semi -- the company itself has gone through many corporate guises over the past 40 years -- perhaps SY could opine. there are people who collect this stuff -- perhaps a computer museum in OZ?

tinkerbell 28th April 2005 07:46 AM

hmmm, so it would not be worth using these old devices?

jackinnj 28th April 2005 11:08 PM

they are probably classified as "unobtanium" --

Stocker 29th April 2005 02:04 AM

If you can find the datasheets, cook something up for yourself. Replacements might be hard to come by, so be sure to triple-check the circuit and connections first, but why not use what you have, if it still works?

tinkerbell 29th April 2005 05:52 AM

that is the problem - datasheets exist for all but the AY T066 devices :(

AntonOfOz 27th April 2012 10:22 AM

I know this is an old thread, and an outside chance, but if you still have this transistor pack and don't need them, I'll buy them from you. I really need only an AY9171 but would buy the lot if the price is right. I'm repairing a Playmaster 136.

dchisholm 28th April 2012 01:15 AM

With those thermal coupling clips I'll bet it's the semiconductor compliment to build an amplifier (or perhaps some other device) documented in an application note or magazine article someplace. The intended circuit showcases the capabilities of some recently-introduced (at that time) component. Would be REALLY cool (and a potential museum exhibit) if you could locate the documentation that goes with the parts.

With the styrofoam packing materials, this is OBVIOUSLY before anybody got concerned about ESD. My guess would be late 1960's.


(Does this get the week's award for thread necromancy?)

AntonOfOz 28th April 2012 02:26 AM

Hi dChisholm,
The amplifier was presented in an Australian hobby magazine to build in Dec 72/Jan 73, to showcase a transistor complement newly introduced by Fairchild. The transistor 'pack' was sold direct by Fairchild in Australia at the time. I do have a copy of the original mag article but it does not have detailed app notes for the transistors themselves. I can't post these to this forum however. The device list in the OP posting is correct.

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