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mr.alex
Dead Key
Posts: 14 Joined: Tuesday 2nd Aug 2011, 0:54First Name: alessandroLocation: italy
Contact:
Post
by mr.alex Wednesday 17th Aug 2011, 6:52
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)
zodiac
Technical Helper
Posts: 319 Joined: Sunday 7th Nov 2004, 13:58Location: UK
Post
by zodiac Wednesday 17th Aug 2011, 13:29
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.
How far is it.
mr.alex
Dead Key
Posts: 14 Joined: Tuesday 2nd Aug 2011, 0:54First Name: alessandroLocation: italy
Contact:
Post
by mr.alex Wednesday 17th Aug 2011, 16:17
Ok...good.
What about the bias current change between MRF477 and 2sc1969 !?
Thanks again.
AleX
