Any info on these vintage radio transistors?

[DJPsychic]

Hey there folks,

Decided to pull these transistors out of an old radio I had in my garage. Can't really find anything on them, maybe one of you has experience with them?

I'm assuming they are silicon?

Here's what I pulled:

(1) SPS-3367
(2) SPS-3368
(1) SPS-3369
(2) SPS-3370
(1) SPS-3371

[mozz]

Not germanium in that style package. Most likely npn silicon. I'll look them up when I get home from work.

[iainpunk]

this is an awesome website, bookmark it and/or tattoo it on you arm so you never forget it. its not a complete ist tho, and sps transistor are listed under the 2sc prefix, like 2SC3367

[DJPsychic]

this is an awesome website, bookmark it and/or tattoo it on you arm so you never forget it. its not a complete ist tho, and sps transistor are listed under the 2sc prefix, like 2SC3367

Awesome thank you


edit: did you mean to link a website?

[Rob Strand]

this is an awesome website, bookmark it and/or tattoo it on you arm so you never forget it. its not a complete ist tho, and sps transistor are listed under the 2sc prefix, like 2SC3367

Those transistors have Motorola branding marks.   

It's quite possible Mototola did make 2SC equivalents.  However when I see Motorola parts starting with an S it usually means they are custom parts.   

So normal parts 2Nxxxx, MJxxxx, MPSxxxx  custom parts  SJxxxx, SPSxxxx.

The following numbers xxxx may or may not correspond to the number for the common part.

So I don't know what the answer is but I would be little sceptical they are 2SCxxxx or MPSxxxx.

A good start would be to first work out which transistors are NPN and which are PNP.  Then perhaps measure the gain.  Then see if the NPN/PNP  matches-up at all with the 2SC or MPS parts.

Some examples in here,
http://matthieu.benoit.free.fr/cross/competitive/Peavey_Transistor_Cross.pdf

I forgot the MJExxxx vs SJExxxx case.

Notice the transistors starting with an S do not always have the same xxxx numbers as the common transistor equivalent.
-------------------------------
Note 2SC transistors are all NPN and Silicon so if *any* of your transistors are PNP *or* germanium (doubt it from package) it throws out the 2SC's altogether.

[Rob Strand]

Perhaps finding a Zenith cross-reference list is a better plan.

Like this one,

http://www.retrotechnology.com/herbs_stuff/zenith_parts_2.txt

Doesn't have your parts but has many links at the top of the file.

[mozz]

(2) SPS-3370 these are npn silicon high frequency nte-108

121-546 nte 108
121-612 nte 108
121-613 nte 108
121-614 nte 108
121-735 nte 107
121-430 nte 123a

As was said, there is a Zenith cross reference chart out there somewhere which would point to a 2N number.

[PRR]

That chassis number can be found at RadioMuseum.

That's not even "vintage" to my eye. FM was rarely done in Germanium, and not in the tacky plastic cabinet this had.

Any radio w/speaker _IS_ an audio amplifier!! Why tear it up?

In *this* case (and in many others): because there is no power transformer. This was a Hot Chassis radio. OK for a radio where you never touch the electronics (radio wave in, sound wave out). Similar contraptions adapted to $9.97 guitar amps shocked many young users and the technique was slowly banned.

Those are all Si NPN. All roughly the same except Q101 was selected for gain at 100MHz and Q402 was a 200V power device (not so useful without its output transformer).

[Rob Strand]

121-546 nte 108
121-612 nte 108
121-613 nte 108
121-614 nte 108
121-735 nte 107
121-430 nte 123a

As was said, there is a Zenith cross reference chart out there somewhere which would point to a 2N number.

I think your idea of using the 121-xxx numbers from the OP's chassis pic is going to go a lot further than the Motorola numbers.

I found this table (need to zoom), which gives type transistors with 2N equivalents for each position in the ckt (like AF-FM, Audio, FM-osc.) .  Unfortunately none of the transistor numbers match the OPs unit.   Notice the table has chassis number in the top left corner.

Click and Zoom:


We need the same table for the chassis number of the OP's radio (8AT16X, 8AT17X).
The equivalents aren't on the table that appears on the schematic,
https://antiqueradios.com/forums/viewtopic.php?f=4&t=313665

[DJPsychic]

Sorry didn't have a chance to check computer yesterday. Thanks everyone for your input, interesting stuff as always. Was just curious if anyone had used these for builds.

I've got a FF breadboard set up I'll play around with em today and see how she goes.

[DJPsychic]

Side question: Do people like to use vintage resistors in builds or just caps/transistors?

[bluebunny]

If you're selling on eBay, then definitely.   

[DJPsychic]

If you're selling on eBay, then definitely.   

Lol. Fair enough.

Really only asking because this radio has a bunch of stuff in it, didn't know if i should be salvaging the resistors or not.

[mozz]

Why not. Cheap disc caps are probably good. Resistors will work if you have room for that size. There may even be a audio transformer suitable for a Octavia.