03-05-2019, 08:45 AM
As you adjust the tuning, the AVC will reduce the gain and the current through the AVC-controlled tubes and that will cause the B+ voltage to rise. I had an RCA Model 50 radio where I replaced the rectifier with silicon diodes and added a VR150 regulator tube and you could tune by the brightness of the regulator, more light = more signal, because the regulator took the current the converter and IF did not take.
It sounds like you either need to reduce the input signal level from your signal generator or disable the AVC by disconnecting it and using a bias battery in its place so the B+ stays constant.
It sounds like you either need to reduce the input signal level from your signal generator or disable the AVC by disconnecting it and using a bias battery in its place so the B+ stays constant.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
