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Germanium power transistors

keravon

Mar 16, 2022
1
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Mar 16, 2022
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Hi All,

I'm trying to find equivalents for AD 149 DE8 N and AD 149 DE3 N Germanium power transistors. Or are they the same transistor?

I am restoring an old GEM organ which has these in the power supply section. As far as i can see they are not functioning.

Thanks for your help.

K
 

kellys_eye

Jun 25, 2010
5,131
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Jun 25, 2010
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5,131
I'm not familiar with the sub-numbering system you refer to but such differences are usually related to the gain of the device. If it's used in a power supply (series regulator) then gain isn't an issue so either device would work. Double check that the differences aren't down to pin out arrangements - but that's easily averted by direct wiring.
 

bertus

Moderator
Nov 8, 2019
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Nov 8, 2019
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2,730
Hello,

The sub-numbering could have to do with production location and production date.
It will be of no influence on the working of the transistors.

Bertus
 
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