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

[tordjak]

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]

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.