Hello,
I have replaced the input switch on a E4406A by a MGS-71018 but I got the same problems as described on Youtube in the different steps of a E4406A repair :
https://www.youtube.com/watch?v=C864ibb65YI&t=1015s
I found that the control lines NEED to provide -5V for the MGS-71018 instead of the -8/9V on the original GG7-4128. To solve the problem , I have installed one 3,9V zener diode on each line between the resistors R333 & R334 and the two control pins of the MGS-71018
I found also that there is another BIG difference between the MGS-71018 and the GG7-4128 : the control lines on the E4406A must be crossed for the MGS-71018 .
So the final wiring is :
R333 - 3,9V zener diode - pin 1
R334 - 3,9V zener diode - pin 3
73s Eric
