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Old 1st December 2014, 12:30 PM   #1
arg_ is offline arg_  Greece
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Default transistor SPS8223

while trying to repair my Tek 2215 B-channel vertical preamp, I fell upon a transistor with this unusual (at least to me) designation. According to the service manual it is a small signal NPN type.

Google does not produce any usable results so I would appreciate any help to find a datasheet that will help me locate a modern equivalent for replacement
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Old 1st December 2014, 12:35 PM   #2
Mooly is online now Mooly  United Kingdom
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Is it an SMD package with 5 legs ?
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Old 1st December 2014, 12:37 PM   #3
arg_ is offline arg_  Greece
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no, it's a standard TO-92
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Old 1st December 2014, 12:40 PM   #4
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Hmmm... dunno then.

You need to see what characteristics are going to be important. If its in the signal stages then hf response and a low Cob could be vital, or if its just doing something more general like a current source etc then perhaps any generic replacement would be OK.
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Old 1st December 2014, 01:21 PM   #5
arg_ is offline arg_  Greece
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thank you Mooly. It is the one pointed by the arrow. Actually all Q257,258,267,268 are of the same type

Click the image to open in full size.

what puzzles me is that SPS8223 and other similar types were used by Tek extensively in the 80's and yet I cannot find any data.
I guess I will have to take out a healthy one to measure the basic parameters. Most probably a BC5xx will do the job
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Old 1st December 2014, 02:33 PM   #6
Mooly is online now Mooly  United Kingdom
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It seems to be just associated with the level shifting and biasing networks so yes, probably a general purpose device should be fine. PNP though
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Last edited by Mooly; 1st December 2014 at 02:34 PM. Reason: PNP NOT npn
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Old 1st December 2014, 02:34 PM   #7
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PNP not NPN lol.
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Old 1st December 2014, 04:56 PM   #8
arg_ is offline arg_  Greece
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Quote:
Originally Posted by Mooly View Post
PNP not NPN lol.
well this also a confusing area. The service manual specifies all Q257,258,267,268 as SPS8223 NPN type while the schematic symbol for Q257 looks more like a PNP

Click the image to open in full size.
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Old 1st December 2014, 06:47 PM   #9
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The voltages marked on the diagram would be correct for a PNP (+5V on E and -3 on C)
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Old 1st December 2014, 08:07 PM   #10
arg_ is offline arg_  Greece
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you are correct, thanks
it seems the manual BOM is not to be fully trusted... maybe they issued a revision/amendment later
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