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Old 4th July 2011, 08:21 PM   #1
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Join Date: Aug 2006
Default Transistor replacements

Hi could anyone let me know if there are sutible replacements for these transistors?


Any information would be gratefully recieved.

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Old 4th July 2011, 08:41 PM   #2
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Join Date: Jan 2006
Location: Athens GREECE
answer is very simple if the aplication is audio amplifier you can replace them with almost anything u like

pin compatible will be a comfort if available and better specs and quality will perform better any way

There is only one thing you need to take care off That will be that chages have to be symmetric ...

For example 2sc1735d looks like a bd 139 if you choose that this is the closest available you need to replace the oposite PNP transistor with a BD 140

re bias the all thing and you are done

for stages like LTP you need to make sure that the replacement parts meet the specs from any aspects current flow ft voltage cob sure that you will find plenty ... also if your amp features current source on the LTP then its much easier .... rest of stages like VAS or vi limiters choosing parts should be a walk in the park

Just last night i fixed a luxman A321 that features a 2SA1239 (unobtainable ) dual DIL6 tranistor.... a couple of closely matched 2N5401 transitors worked like a charm !!!

Kind regards sakis

Last edited by east electronics; 4th July 2011 at 08:44 PM.
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