What to look for in a replacement complementary output transistor? - diyAudio
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Old 11th November 2007, 04:51 PM   #1
spooney is offline spooney  United States
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Join Date: Dec 2006
Default What to look for in a replacement complementary output transistor?

I'm doing work on a car audio amp and am having some trouble locating exact replacements for the output transistors. How do I determine if another transistor will work as a replacement?Do I just need to find one with equal or higher maximum ratings?The transistor in question is a KTB688. I have a few 2sa1909 transistors laying around and the ratings appear to be higher.Will this part work in place of the KTB688?Also if it will work will i need the complement to the 2sa1909 or will the complement to the ktb688 work with the 2sa1909?
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Old 11th November 2007, 04:54 PM   #2
AndrewT is online now AndrewT  Scotland
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Location: Scottish Borders
the b688 could be short form for 2sb688.
the complement would be 2sdxxx?

or could ktb be a FET which are very popular in car audio?
regards Andrew T.
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Old 11th November 2007, 05:21 PM   #3
spooney is offline spooney  United States
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KTB688 and 2SD688 are the same part pretty much with different prefixes.The complement would be the KTD718 or 2SD718
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