The channel switching mod to the old Siemens 6 S Ela 2427c installed. The optocouplers circuit board found a place.
![Siemens 6 S Ela 2427c](https://www.zeta-sound.se/wp-content/uploads/Siemens2028229-1024x484.jpg)
Another view, on the left is the input jack, switch for channels and a remote jack for channels.
![Siemens 6 S Ela 2427c](https://www.zeta-sound.se/wp-content/uploads/Siemens2028129-1024x490.jpg)
I removed the guts from the pilot lamp and installed the channel indicating leds in it. We can see the two new pots installed, a clean volume pot and a mids pot.
![Siemens 6 S Ela 2427c](https://www.zeta-sound.se/wp-content/uploads/Siemens2028329-1024x484.jpg)
Another view where you can see the new wiring to the old pilot lamp now acting as channel indicator.
![Siemens 6 S Ela 2427c](https://www.zeta-sound.se/wp-content/uploads/Siemens2028429-1024x484.jpg)
/Krister