Need matched transistors to: McIntosh Mc-431, HK 400Q, SS 405

tordjak · 21st November 2011, 07:59 PM

Hi all :-)

I have "same" problems with :
McIntosh Mc431, Soundstream 405, Harman/Kardon TC-400Q
car amplifier.

All three amps were broken when I bought them on ebay.

And I can not find the parts needed, in Sweden,

requires matched transistors says my repairman.

Are they something else that might need to be replaced as a preventive measure?

Can someone help me?

Greetings from Sweden

AmpliFire · 23rd November 2011, 04:28 PM

Well, a bit more precise information about which transistors (which location/function) in the each unit would be very helpful. In other words, I could recommend to start with obtaining the service manuals. Then, semiconductors like transistors hardly fail by their own; their failure is often caused by other failing components like capictors and resistors (or shorting speaker terminals). In other words, you have some work ahead of you.

21st November 2011, 07:59 PM	#1
tordjak diyAudio Member Join Date: Jun 2010	Need matched transistors to: McIntosh Mc-431, HK 400Q, SS 405 Hi all :-) I have "same" problems with : McIntosh Mc431, Soundstream 405, Harman/Kardon TC-400Q car amplifier. All three amps were broken when I bought them on ebay. And I can not find the parts needed, in Sweden, requires matched transistors says my repairman. Are they something else that might need to be replaced as a preventive measure? Can someone help me? Greetings from Sweden

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23rd November 2011, 04:28 PM	#2
AmpliFire diyAudio Member Join Date: Oct 2011 Location: Paris, France	Well, a bit more precise information about which transistors (which location/function) in the each unit would be very helpful. In other words, I could recommend to start with obtaining the service manuals. Then, semiconductors like transistors hardly fail by their own; their failure is often caused by other failing components like capictors and resistors (or shorting speaker terminals). In other words, you have some work ahead of you.

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