250M Strange transistors

[ocdecio]

I am working on what looks like a very original 250M. Inspecting the outputs on left side, this is what I found. The transistors are very oddly numbered (the HK ones have true Marantz part numbers on them, not transistor codes) and the others are 2N types which I had never seen before.

The diff pair also has very odd numbers.

So I guess my question is if anyone have seen these before.

 

[ivandezande]

Replace them all. Super early stuff, I don't trust the Fairchilds, maybe the Motorolas but still.

 

[ocdecio]

Replace them all. Super early stuff, I don't trust the Fairchilds, maybe the Motorolas but still.

Sure, no doubt. Installing new MJ's.

 

[quadmatrix82]

Maybe an early warranty repair? I don’t think would be factory seeing the heat sink smudges for the outputs

 

[ocdecio]

Maybe an early warranty repair? I don’t think would be factory seeing the heat sink smudges for the outputs

It could be. The orange and yellow dots make them original to me.