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Hello!

I'm fixing old Hong-Kong made 8 transistor SUTTON AM-radio.
I found this transistor as defective. Does anyone know what
is this transistor? I can't find anything using Google.
There is manufacturers logo which is 'F' and following type

CS1092G 177

This radio was made in 1964 so I believe this is a germanium one.

It is not a germanium, it is a silicon. Germanium transistors must be
in metal cans.

Not all the germanium transtors were in metal cases.

Germanium cannot be passivated with metal oxide like silicon can.
Therefore a germanium transistor would become contaminated soon after
being put into an epoxy package.

I remember well when I used OC71 -germanium transistor
as light detector scraping the black paint off so that
light influenced directy to the transistor itself. :-)

Glass case is like metal, it's not contaminating, but it's more
fragile than metal or epoxy. So it's seldom found in transistor
packages in the U.S.

But your point is a good one. It can be possible.
The radio is quite old and these usually were all
germanium -transitorized.

Some radios made in the '60s used both germanium and silicon
transistors. The silicons showed best performance in the RF and IF
sections, and the germaniums were used in the audio amp and output.

The transistor is in a TO-106 case and made by
Fairchild. Depending on where it is in the circuit, it could be a
mixer/converter, an IF, or an audio amp. In the '60s, many of these
transistors were used in AM and AM/FM radios. They're inexpensive
jellybean parts and are usually in the 2N5232 series numbering range.
The IF transistors used some kind of AGC, which may make it necessary
to choose a transistor with that characteristic. But othewise, just
about any silicon transistor can be used. If you change a transistor
in a tuned ircuit, you may have to retune it.

Thank you for explanation. It is the first HF-transistor
and is directly connected to the ferrite antenna/coil.
I'll try something. Probably any modern HF-transistor
will work fine. I'll let know if it worked.

This transistor is usually the oscillator and converter. I erred when
I said 2N5232 above; I should have said 2N5132.

Matti Kaki OH2BIO


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