Replacing burnt out transistorin Grundig FineArts Amp

[chris14679]

Hello! Can anyone help me with this? ....:

I have a grundig finearts M100-A amplifier which has burnt out on one side. This has happened before and I was lucky enough to buy a matching amp which had also burnt out on one side. I was able to combine the two good amplifier modules to make one good amp.

Now the same thing has happened again so I have three burnt out modules and one good one. I'm now using the amp in mono with the bad amp disconnected (nice modular design!). These are good amplifiers - 300w RMS at 4 ohms and I have all the matching seperates so I hope I can resurrect them.

When the module burnt out, the symptom was one or both of two small unmarked transistors on the opposite top corners of the amplifier circuit board visibly melting and burning out in a puff of smoke. If I simply replace these transistors, is that likely to fix the amp or have they burnt out in a chain reaction because of something else?

If it is worth replacing them, how can I determine the right component to replace them with? I have the one good module which I can measure the components on if anyone can tell me how. I only have the most basic electronic knowledge so an idiots guide please!!!

Seems that this is a common problem with these amps so maybe someone has seen it before?

Many thanks for any help you can offer!

Best wishes,
Chris