Ampeg matched transistors

[Tiny_Daddy]

I am looking an an Ampeg 210SP with four output transistors, IRF140. One of the transistors has shorted. I notice two of the transistors have been marked with a blue dot and the other two with a red dot. Are these matched transistors? Available only from Ampeg?

[Tiny_Daddy]

Well only two of the 4 output transistors were shorted so I cut them loose. The amp gives the appearance of working.