Germanium investigations

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PRR

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This is what I am familiar with. Also in Cyrillic one can recognize temperature, wattage, currents and voltages.
BTW to keep this guys off at elevated temperatures you need to apply "negative" actually positive bias at the base.
 

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PRR

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I have real doubt those numbers are typical. But lets roll with them.

> ...germanium power devices ...seem to be low power rated compared to similar size silicon...

Typical working temperature: Si=160 Ge=70

Typical working temperature RISE above 25C: Si=135 Ge=45
135/45 = 3

For the same size mounting face, the Si device can dissipate 3X the power of a Ge device before 'melting'.

As alexberg says, often the limit is how much reverse bias you can apply and control.
 
I have real doubt those numbers are typical. But lets roll with them.

> ...germanium power devices ...seem to be low power rated compared to similar size silicon...

Typical working temperature: Si=160 Ge=70

Typical working temperature RISE above 25C: Si=135 Ge=45
135/45 = 3

For the same size mounting face, the Si device can dissipate 3X the power of a Ge device before 'melting'.

As alexberg says, often the limit is how much reverse bias you can apply and control.

Thank you for the insights. Very helpful information. It will be fun to see what Nelson cooks up for these parts.
 

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Vintage Ge decade transistors packagings collection :)
 

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:umbrella:
 

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