03-09-2013, 11:53 PM
Beautiful work Terry!
After some playing around, I have made a few minor changes to the Model 81. The changes are shown in the attached drawing (highlighted in green). The changes helped normalize the volume adjustment quite a bit. It is also quite a bit more linear. Prior to this, there was very little volume control range, especially with strong stations. I have adjusted the sensitivity, based on the strength of the stations in my area and don't appear to have any overloading issues. The size of the resister across the Antenna coil may need adjusted based on the strength of the stations in your area.
After some playing around, I have made a few minor changes to the Model 81. The changes are shown in the attached drawing (highlighted in green). The changes helped normalize the volume adjustment quite a bit. It is also quite a bit more linear. Prior to this, there was very little volume control range, especially with strong stations. I have adjusted the sensitivity, based on the strength of the stations in my area and don't appear to have any overloading issues. The size of the resister across the Antenna coil may need adjusted based on the strength of the stations in your area.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
