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16th August 2008, 09:19 AM
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#2 |
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diyAudio Member
Join Date: Jul 2008
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Wow... what a question. What do you mean by that?
Considering low noise: BC550, BC556, BC549B, BC109B, BC547B, BC179, BC477, BC177. To make a final choice you will need to consult the tables of technical data which are normally provided in catalogues. I suggest this site: http://www.im.pwr.wroc.pl/~med/jn/karty_katalogowe.html .pdf files provides information you need. Peace! TH.J.B
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Success is the ability to go from one failure to another with no loss of enthusiasm. |
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16th August 2008, 10:10 AM
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#4 |
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diyAudio Member
Join Date: May 2007
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that's definately true
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23rd August 2008, 09:37 AM
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#7 |
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diyAudio Member
Join Date: Feb 2002
Location: Sydney
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anyone remember the OC71 ?...oops, showing my age...
(used to be common in the 60s, and you could scrape the paint off and make a phototransisitor... 
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‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky |
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24th August 2008, 12:30 AM
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#9 |
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diyAudio Member
Join Date: Dec 2005
Location: the north
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Germanium Power Transistors
if you are looking for
germanium power transistors ( >= 1 Ampere ) it is not many complementary pairs PNP + NPN There are however some powerful devices. I have found one guy selling NEW EXEMPLARS in Original Package of these: > 2N268 .. PNP .. 80Volt 3Ampere 30Watt .. looks almost like TO-3 > OC16 .. probably PNP ...in older power case They do NOT come cheap  Complementary Pairs. Often used are: -------------------------------------- AC127 + AC128 0.3 / 1 Watt AC187 + AC188 1 / 1 Watt So AC187 (npn) + AC188 (pnp) are one of the few Pairs above 1 Watt See attached picture of 2N268, 30 Watt PNP
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24th August 2008, 12:42 AM
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#10 |
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diyAudio Member
Join Date: Dec 2005
Location: the north
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Germanium Transistor List
There are lists with DATA specifications
of some Germanium transistors. I will put together one PDF or ZIP file, later. OC16 .. I mentioned is: PNP, 32V 1.5A 6.25Watt By the way, in Solid State forum if you post germanium question there you will probably get a lot more info from Older Electronics Repair Service members. We have quite a few of those at www.diyaudio.com I know Enjoy Lineup Germanium Transistor History & Info forum
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what are the best germanium transistor npn and pnp ??
