I am not sure how to change the deemp from 75 to 50 us.
Schematic can be seen here:
Thanks for help.
Wich serial number you have on your MR78 ? de-emphasis is not the same for all serial numbers .
Did not see your message, because we will not be notified.
Email also seems to be impossible (try to contact the webmaster..).
The serial is AD2636.
Remove C331 and C334 from the MPX PC BOARD 044-552
Replace C406 and C407 on the OUTPUT AMPLIFIER BOARD 044-794 for 1.2 nF instead of the current 100 pF
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