Why is different type of transistor use in left/right channel? - diyAudio
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Old 29th November 2002, 04:57 AM   #1
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Join Date: Nov 2002
Location: HK
Unhappy Why is different type of transistor use in left/right channel?

Hi all,

My amp is broken down and when I check inside, I found that the power transistor Sankan c3856 is blown - no physical damage but when I check with a meter, there is no resistance between the 3 legs. Luckily, I found some parts in a local store that sell them in pairs. But I want to know why use two different type of Sankan transistors for each channel:
2sa1492/2sc3856 for left channel
2sa1294/2sc3623 for right channel

I check in Sankan site and notice that the a1492/c3856 pair is the single emitter type and the a1294/c3623 pair is the LAPT type. Can anybody enlighten me on the advantage of such configuration. Shouldn't both channel be identical???

Also, should I match the replacement transistors?



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Old 29th November 2002, 06:47 AM   #2
Join Date: Dec 2001
Location: Zamboanga, City of Flowers, Mindanao
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Lightbulb Different transistors

Hi Chuck,
Your amp might be repaired before.
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Old 3rd December 2002, 09:30 AM   #3
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Join Date: Nov 2002
Location: HK
As I thought. I guess I'll have to use A1294 for both channel. It is too bad I can't buy matched pairs of transistor here.
However, I found something else is wrong of the channel with the blown transistor. One resister is fried and some low signal diode is zapped. I'll replace them as see what happens.
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