09-14-2025, 09:30 AM
Hello Glenn,
This reminds me of the German radios from the late 50s early 60s I have restored. The Germans perfected the r-c negative feedback in every set they produced. If you look up the schematic for a Grundig 3198 or any model in that number range you'll see what I mean. You'll even find their warnings that if the opt is replaced the secondary wire connected to the feedback network must be the correct phase as was pointed out in the link above. But it works fine and it's a simple application.
This reminds me of the German radios from the late 50s early 60s I have restored. The Germans perfected the r-c negative feedback in every set they produced. If you look up the schematic for a Grundig 3198 or any model in that number range you'll see what I mean. You'll even find their warnings that if the opt is replaced the secondary wire connected to the feedback network must be the correct phase as was pointed out in the link above. But it works fine and it's a simple application.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
