I have an AC-DC Electronics power supply model OEM12N9.5.
It just died. I checked the transistors and one of the pair seems to be open. It's labeled STI (best I can read) 54-031. It's a PNP in a TO-3 case.

There are two of them, one checks OK with an ohmmeter, the other doesn't. The pair are driven by a 2N5956 in a TO-66 case. The 2N5956 checks OK.

I'd like to repair the supply but I can't find any info on the STI transistors.

Would any good PNP power transistors work instead?

Thanks in advance.
Jack

P.S. Not sure this is the proper forum, so move me if necessary.

 

google 2n5956

 

google 2n5956

I did. I need the other transistors.

 

Maybe a close up picture of the transistor might help.

 

Here's a pic.

 

No ideas on these transistors?

Does anyone possibly have a schematic for the AC-DC OEM12N9.5 power supply?

Jack

 

Some quick use of Google gave me some info. RCA once produced a transistor named RCA 54-031-017. It looks like this transistor is equivalent to the 2N3772 transistor. From here http://www.befr.ebay.be/itm/2-trans...2N3772-tsf-radio-audiophile-ham-/200815487326
However how correct this is for your case. I do not know at all

 

Thanks! That really helps.