At 06:29 AM 11/1/2011, you wrote:
>Is there anyone on here that has experience with germanium=20
>transistors used in
>logic circuits ?

<...>

>Any ideas on the cause ?

Looks like it's thermal. Heating decreases the hfe, which causes more
heating etc.

Those old things are horrific compared to modern Si transistors.. slow as
molasses, leaky, limited temperature range, very limited power dissipation.

Some of the old painted glass grease-filled parts could have the black
paint scratched off and then they could be used as a terrible phototransist=
or
rather than a terrible transistor.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the rewar=
d"
speff@interlog.com             Info for manufacturers: http://www.trexon.co=
m
Embedded software/hardware/analog  Info for designers:  http://www.speff.co=
m



--=20
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