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Old 22nd August 2007, 03:12 AM   #1
aldovan is offline aldovan  Brazil
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Default 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
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Old 22nd August 2007, 05:05 AM   #2
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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
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Old 22nd August 2007, 05:32 AM   #3
djk is offline djk
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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.
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Old 22nd August 2007, 05:35 AM   #4
anatech is offline anatech  Canada
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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
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Old 22nd August 2007, 04:25 PM   #5
m2003br is offline m2003br  Brazil
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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
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Old 22nd August 2007, 04:34 PM   #6
m2003br is offline m2003br  Brazil
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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
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Old 22nd August 2007, 07:00 PM   #7
anatech is offline anatech  Canada
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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
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Old 22nd August 2007, 08:00 PM   #8
m2003br is offline m2003br  Brazil
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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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Old 22nd August 2007, 08:17 PM   #9
poynton is offline poynton  United Kingdom
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Default Re: Unknown transistor - Help !!!

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
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Old 22nd August 2007, 08:49 PM   #10
anatech is offline anatech  Canada
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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
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