Germanium transistors - what do I do?

[SillyOctpuss]

Thanks everyone. I'll breadboard a fuzzface to try them out and go from there. I'll report back after I've tried a few things

 

[Chuck D. Bones]

Just received 56 of these (that was all the guy had). Only sampled a few so far. This one may be the hottest of the bunch...



Check the LDC! Spring of 1969. Beck-Ola had just been released.

 

[SillyOctpuss]

Wow. What's the highest hfe you've ever seen on a germanium transistor @Chuck D. Bones ?

 

[Chuck D. Bones]

That is pretty high. I've measured a couple of 2N1308's approaching 300. That part number is selected for high gain. I bought a lot of 100, tested them all and at least half were over 150.

 

[Chuck D. Bones]

Here's the hottest Ge trans I've measured, it's a 2N1309 from that same buy. Had to run it on the curve tracer to verify.





At the center of the graph, the collector current lines are 3.5 minor divisions apart, or 700μA. The base current steps are 2μA apart. HFE = 700μA/2μA = 350. The top two lines are a little over 900μA apart. HFE = 900μA/2μA = 450. It's real. I found 32 of 'em with HFE > 250.

 

[cooder]

That is some hot stuff there, wonder how they sound! Also, as far as I can tell the cheapy 328 tester seems to agree with the more fancy curve tester then mostly, right?
This is all pretty rivetting stuff, I got a bunch of Russian trannies that made it here after a 2 1/2 month odessey through the murky waters of international shipping and I still have a few more to come, fingers crossed...

 

[Chuck D. Bones]

All of the Russian trannies I've bought measure HFE < 100, mostly around 60 - 70. Which is fine. I have no clue where to use a High-Gain Ge transistor, but I'll figure it out.