Unknown transistor - Help !!!

aldovan · 22nd August 2007, 02:12 AM

Dear friends

I have a old radio with a unknown damaged transistor.
The transistor have the motorola logo and is write "8113 STASIS PNP" in the package TO-3.
I need change this transistor. Anyone known this motorola code and can identify this transistor ?

Thanks,

Aldovan

gmphadte · 22nd August 2007, 04:05 AM

If it is a transistorized radio, then u may have same transistor in other stage(s). Check if the transistor is Ge or Si, then replace with any modern transistor of similar size and type(RF or AF). U will not damage anything. Install the pins properly.

Gajanan Phadte

djk · 22nd August 2007, 04:32 AM

Sounds like a Threshold amp to me.

Use MJ15025 for PNP, and MJ15024 for NPN.

Do not even think about replacing one output, replace them all.

anatech · 22nd August 2007, 04:35 AM

Hi djk,

Quote:

Sounds like a Threshold amp to me.

I was about to say that!

Quote:

Use MJ15025 for PNP, and MJ15024 for NPN.

Yup. Nelson may have some insights on that. I wonder if he ever took this design further?

Quote:

Do not even think about replacing one output, replace them all.

Absolutely!

You left me darn near nothing to say here djk!

-Chris

m2003br · 22nd August 2007, 03:25 PM

Hey Guys,

Aldovan says: "I have a old radio with a unknown damaged transistor"
It has nothing about Threshold amps...

Aldovan,

read my answer in your topic about 2N176.

Cheers,

Marcos

m2003br · 22nd August 2007, 03:34 PM

Aldovan,

Are you testing properly this germanium transistors?

Junction voltages is about 0.1 to 0.2V, gain is low and lots of leakage is the norm...and not mean a defective component.
If you have only one TO-3, its a "A Class" output, steady state current was about 1 to 2 Amperes.

Marcos

anatech · 22nd August 2007, 06:00 PM

Hi m2003br,

Quote:

Aldovan says: "I have a old radio with a unknown damaged transistor"
It has nothing about Threshold amps...

Well, this is interesting

Quote:

The transistor have the motorola logo and is write "8113 STASIS PNP" in the package TO-3.

We were hoping Aldovan would then give us the make and model of the radio. Since this is still a mystery, no comment can be made by anyone. Agreed?

Quote:

Are you testing properly this germanium transistors?

Now, either you have information that no one else in this thread has or you just jumped to a conclusion.

Would you care to share Marcos?

-Chris

m2003br · 22nd August 2007, 07:00 PM

Hi Anatech,

Aldovan have another recent topic in diyAudio, where he asked for especifications for an old germanium TO-3 transistor, 2N176
and, all in all, old Motorola radios don't have anything with Threshold amps, and, from my best knowledge, all of this radios (existing in Brazil, at least) have germanium output transistors.

Marcos

poynton · 22nd August 2007, 07:17 PM

Quote:

Originally posted by aldovan
Dear friends

I have a old radio with a unknown damaged transistor.
The transistor have the motorola logo and is write "8113 STASIS PNP" in the package TO-3.
I need change this transistor. Anyone known this motorola code and can identify this transistor ?

Thanks,

Aldovan

Hi.
If it is an old Motorola car radio with a single output transistor

any of the following can be substituted :-

OC35
OC28
2N176

Look on EBAY.

The 2N176 was the'original' car radio output transistor !!

See :- http://semiconductormuseum.com/Photo...rola_2N176.htm

Good luck

Andy

EDIT :- How many do you want ?

http://cgi.ebay.com/184-RARE-MOTORLO...QQcmdZViewItem

anatech · 22nd August 2007, 07:49 PM

Hi Marcos,
Thank you. This I didn't know.

For an old radio - yes. A Germanium transistor. These radios need a speaker hooked up or they may blow that transistor if memory serves.

-Chris

22nd August 2007, 02:12 AM	#1
aldovan diyAudio Member Join Date: Jul 2005 Location: Campo Grande city	Unknown transistor - Help !!! Dear friends I have a old radio with a unknown damaged transistor. The transistor have the motorola logo and is write "8113 STASIS PNP" in the package TO-3. I need change this transistor. Anyone known this motorola code and can identify this transistor ? Thanks, Aldovan

22nd August 2007, 04:32 AM	#3
djk diyAudio Member Join Date: Feb 2001 Location: USA	Sounds like a Threshold amp to me. Use MJ15025 for PNP, and MJ15024 for NPN. Do not even think about replacing one output, replace them all. __________________ Candidates for the Darwin Award should not read this author.

22nd August 2007, 07:49 PM	#10
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Marcos, Thank you. This I didn't know. For an old radio - yes. A Germanium transistor. These radios need a speaker hooked up or they may blow that transistor if memory serves. -Chris __________________ "Just because you can, doesn't mean you should" © my Wife

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22nd August 2007, 04:05 AM	#2
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	If it is a transistorized radio, then u may have same transistor in other stage(s). Check if the transistor is Ge or Si, then replace with any modern transistor of similar size and type(RF or AF). U will not damage anything. Install the pins properly. Gajanan Phadte

22nd August 2007, 03:25 PM	#5
m2003br diyAudio Member Join Date: Dec 2004 Location: Sao Paulo	Hey Guys, Aldovan says: "I have a old radio with a unknown damaged transistor" It has nothing about Threshold amps... Aldovan, read my answer in your topic about 2N176. Cheers, Marcos

22nd August 2007, 03:34 PM	#6
m2003br diyAudio Member Join Date: Dec 2004 Location: Sao Paulo	Aldovan, Are you testing properly this germanium transistors? Junction voltages is about 0.1 to 0.2V, gain is low and lots of leakage is the norm...and not mean a defective component. If you have only one TO-3, its a "A Class" output, steady state current was about 1 to 2 Amperes. Marcos

22nd August 2007, 07:00 PM	#8
m2003br diyAudio Member Join Date: Dec 2004 Location: Sao Paulo	Hi Anatech, Aldovan have another recent topic in diyAudio, where he asked for especifications for an old germanium TO-3 transistor, 2N176 and, all in all, old Motorola radios don't have anything with Threshold amps, and, from my best knowledge, all of this radios (existing in Brazil, at least) have germanium output transistors. Marcos

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