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Dr. Bob
Moderator
Australia
6593 Posts |
 Posted - 10/27/2008 : 13:12:49
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Hi Racer X & Guys
I have heard many-mostly good reports about the CCCP Ge transistors,
and I have also heard a few stories, that the transistors don't perform very well, or you get a low "GOOD" yield, due to things like excessive leakage.
I know you (Racer X), are familiar with Ge transistors & their inconsistencies.
I recently purchased a HEAP of AF111 Ge's from one of my reputable suppliers of NOS goodies.
And as I mentioned above; After testing, I didn't get many good ones.
Through no fault of the supplier.
You must remember, that when these devices were manufactured, the semiconductor industry, was in its infancy, & there were not able to refine the impurities out of the Ge, as well as they do in modern times.
The impurities in the Ge & the low quality doping agents, tend to attack the the transistor's EBC junction, & literally eat it away.
I hope you didn't mind the quick history lesson.
I used to work for Motorola, & learned many things about semiconductor manufacturing pro's & limitations.
They were exciting times, lots of new innovations & manufacturing processes were discussed, both theoretical & real.
If you have a spare weekend, I have a small library, that shows & talks about semiconductor manufacturing in the early days.
Fascinating stuff for some Tech Heads.
One book even talks about, & describes a new device they call it an IC (Integrated Circuit) all 12 & then later 26 components in density.
What will they ever think of next?
Regards Dr. Bob
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Edited by - Dr. Bob on 10/27/2008 13:14:03 |
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Russian / ex - USSR transistors
first_transistor.jpg