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Old 20th October 2011, 08:51 AM   #1
juoto is offline juoto  Finland
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Default Equivalent transistors

Hello!

Does enybody known equivalent transistors to 2SA634/2SC1096?
I am building an amplifier from next link:

Jean Hiraga's Super Class-A Amplifier

Thanks!
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Old 20th October 2011, 08:56 AM   #2
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BD139/140 or MJE340/350.
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Old 20th October 2011, 10:39 AM   #3
AndrewT is offline AndrewT  Scotland
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These two alternatives are so different in their characteristics/parameters that they cannot possibly be equivalent.
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Old 22nd October 2011, 01:27 PM   #4
juoto is offline juoto  Finland
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Can anybody help?

Can I use 2SA634/2SC1096 as drivers and 2SA1943/2SC5200 as power transistors?

Juoto
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Old 22nd October 2011, 03:10 PM   #5
AndrewT is offline AndrewT  Scotland
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I don't have data for 2sa634. I suspect not many Members have downloaded that data.
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Old 22nd October 2011, 05:25 PM   #6
jez is offline jez  United Kingdom
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MJE15030 and MJE15031 would be excellent substitutes.
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Old 22nd October 2011, 05:36 PM   #7
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You can go to the B&D enterprises site to download the data sheets for the 636/1098. I belive they have stock on them.

2SA636
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Old 22nd October 2011, 05:52 PM   #8
mjf is offline mjf  Austria
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my comparison table says:
2sa634 pnp af-s-power uc=40/30v ic=3a ptot=10w at 25celsius
ft=55MHz current gain = 40...250
and i found this:

http://www.datasheetcatalog.org/data...49/49053_1.pdf
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Old 2nd November 2011, 07:46 AM   #9
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What I remember is important, is the constant Hfe, and the BD139/140 have that.
And the Cob of the 2SA634/2SC1096 is selected to fit the output pairs. On that I cannot comment as it is trial and error for Hiraga.

Hiraga writes in 1980:
Quote:
These transistors, NEC 2SA634 and 2SC1096 allow, coupled with the output transistors 2SA649 and 2SD218, an optimum combination. The only regret is that this complementary pair of power transistors is not manufactured any more. Giving the 50W class-A Kanéda amplifiers (connection in parallel) the best results that one can have, these pairs are now replaced by the 2SC188 and 2SA627 which are fortunately of very similar quality.
So I doubt if current vendors have them - I would call that fakes by definition, not even replacements.
Same specs is not same sound by default. . . just to spoil the game, I'm sorry.
albert,
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