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Author Topic: How to test Western Electric GF45011 transistors  (Read 3435 times)
WB7UPP
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« on: June 28, 2013, 02:21:46 PM »

Does anybody know how to test these scarce WE GF45011 transistors safely? I would hate to ruin them.
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WX7G
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« Reply #1 on: June 28, 2013, 02:51:09 PM »

Using a DMM set to the Diode Check mode measure from base-to-collector and base-to-emitter. The DMM negative lead goes to the base. The voltage measured should be roughly 400 mV.
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WB7UPP
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« Reply #2 on: July 04, 2013, 06:37:54 PM »

I finally figured out they test like any other PNP Germanium transistor. Was asking because the readings I got were strange. Turns out the first few I tested were bad, and most of them were. A good one shows around 250mv on both juntions forward biased, and open any other way. Those showed gain properly, but it seems low to me. A lot came out with a gain of 8, some up to 50.
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KE3WD
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« Reply #3 on: July 05, 2013, 06:57:01 AM »

Sounds like these may be of the old Point Contact construction type. 

Point Contact does indeed deteriorate with time, I make a point not to use these today, if you have to replace one, there are available Germanium type modern replacements that can often be matched up as to the gain requirements. 


73
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WB7UPP
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« Reply #4 on: July 06, 2013, 08:57:34 AM »

Information on the Transistor Museum site for Western Electric GF45011 says they are diffused base type.
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