Replacement transistors in Leach Superamp. Help needed! - diyAudio
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Old 3rd November 2009, 08:01 PM   #1
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Default Replacement transistors in Leach Superamp. Help needed!

Hi Guys!
I am new here

I am building leach Super Amplifier the PCB's are allready done, but there is a problem - i can't buy the 2N3439/2N3440 and 2N5415/2N5415 transistor pairs in my country. Can someone suggest replacement transistor pairs for these transistors in Leach Supeamp original design?

P.S. sorry for my english.
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Old 3rd November 2009, 08:35 PM   #2
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sorry its - 2N3439/2N3440 and 2N5415/2N5416
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Old 3rd November 2009, 09:15 PM   #3
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Location: D-55629 Schwarzerden
I would use therefore follow types:
1) DIODES (formerly ZETEX, include Spice-model)
ZTX658/758 400V-1A-1W >50MHz E-Line (TO-92 compatible)
== Diodes ==
== Diodes ==
2) 2SA1479/2SC3789 300V-0,1A-7W 70MHz, TO126
Property
I have create an overview about a wider range of high voltage transistors about
High Voltage BjT's for Pre-driver stages of High Power Amplifier - Overview
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Old 4th November 2009, 06:42 AM   #4
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And what about 2SD669/2SB649 transistors for 2N2440/2N5415 pair ?
And which for other?
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Old 4th November 2009, 02:42 PM   #5
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Location: D-55629 Schwarzerden
old and no longer available , only 120V resp. 160V from Hitachi
2SB649 Datasheet pdf - Silicon PNP Epitaxial - Hitachi Semiconductor
2SD669A Datasheet pdf - Silicon NPN Transistor - Hitachi Semiconductor
please check out rs components, farnell and digichip for others

Last edited by tiefbassuebertr; 4th November 2009 at 02:45 PM.
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Old 4th November 2009, 05:12 PM   #6
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In my country they are aviable thats why i am asking about them !!!
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Old 4th November 2009, 07:18 PM   #7
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Quote:
Originally Posted by AudioAmpFanat View Post
In my country they are aviable thats why i am asking about them !!!
If they are orig Hitachi components and no copies from unknown brands and 120/160V are appropriate Uce voltage, you can buy it. If only copies available, I would not buy perhaps there are counterfeits - for more informations please read carefully this:
Counterfeit Transistors
By the way - where is your country? - "Antarctica" is a junk - isn't it?
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Old 4th November 2009, 07:45 PM   #8
AndrewT is offline AndrewT  Scotland
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are suitable alternatives listed in the later LO TIM articles?
__________________
regards Andrew T.
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Old 4th November 2009, 09:12 PM   #9
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I doubt that they sell fake components here in Latvia.

Salvats
Salvats

Ok but whitch transistors i can use to replace 2N3439/2N5416 ?
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Old 5th November 2009, 12:17 AM   #10
wg_ski is offline wg_ski  United States
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MJE340 and MJE350.
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