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Hallo and goodevening from Italy...

I have another President Jackson 1st version..

I have seen that this RTX are using the 2sc1969
instead of MRF477.

Who knows the steps to go back at the original MRF477 !?
I know that 2sc1969 has different pin respect to MRF477 ..

I'm wating for your reply

Regards
Alex (Italy - RM)

It should be a case of replacing the correct transistor MRF477 for the 2SC1969 and checking the bias but make sure that the two capacitors C187 and C188 (both 560pF) have not been removed, if they have then you must replace them.

Ok...good.

What about the bias current change between MRF477 and 2sc1969 !?

Thanks again.

AleX