Need matched transistors to: McIntosh Mc-431, HK 400Q, SS 405 - diyAudio
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Old 21st November 2011, 07:59 PM   #1
diyAudio Member
Join Date: Jun 2010
Default 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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Old 23rd November 2011, 04:28 PM   #2
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AmpliFire's Avatar
Join Date: Oct 2011
Location: Paris & The Hague
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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