marshall g80r cd

[Andui]

I know this doesn't belong in this forum but i think this is the only place where people know an answer on this.

i have a marshall g80r cd amp. but the transistors are blown.
i want to put new transistors in it but i don't know wich type i have to buy.
the only thing that's stamped on is: marshall t64 and on the other one marshall t65.

does anybody know what kind of transistors this are and with what other transistor can i replace them.