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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
For germanium you should think positive earth; almost all germanium bjt were pnp - especially power-types just as most silicon bjt are npn - especially power.
Just invert the diagram; +Vbatt becomes -Vbatt exchange pnp for npn and vice versa invert/reverse all diodes and polar capacitors etc.
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
No luck with them either...Seems ebay wants around 10$ total for just a small crappy old transistor!Why do they charge 5$ to ship a transistor that needs a lab scale to weigh?Hijueputa!
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Surely you'll get them cheaper from a regular distributor.
Using RS in the UK, they want GBP1.49 for AC128 PNP, or GBP2.89 for the complementary NPN AC127 (just like silicon, the "other" polarity is available, but it's more expensive and not quite as well specified). These parts, along with the medium power AD161/162 pair, also tend to be stocked by the "old radio repair" suppliers, as both pairs were very popular in portable (ac127/8) and table top (ad161/2) radio output stages of a few decades ago.
If you can find a 70's tranny radio in a yard sale, it will likely have a few germaniums in it.
If you *really* can't find them in the US in digikey or ratshack, I could buy one here and post it at cost.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
I have few small germaniums around here like AC550, AC551, 2SB178 and even some wierd rusian things (name is written in Cyrilic!) and they are all PNP. And several of AD465 power germaniums (big TO3)
Most are found in all those ultra-old stuff I used to dig out from school cabinet.
And they are indeed sold at some places for repair. Getting such a little thingy from somewhere arond the world would take ages..
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WANTED- Germanium NPN transistors
