02-14-2010, 05:56 PM
I did some further checking. With the RF gen. and the tuning dial set to 1.1Mhz I connected it to first the antenna terminal and then to the grid of the 6A8 and measured the signal amplitude on my scope at the speaker voice coil. I kept the signal level low so as not to saturate the AGC. The P-P voltage level, and also the audible 400Hz tone, was 2-3 times higher when the generator was connected to the antenna terminal! I also have the chassis connected directly to house ground and the RF gen. coupled through a 0.01uf cap.
However when I touch first the antenna terminal and then the grid of the 6A8, making my body an antenna, the signal level is much higher when I touch the grid of the 6A8. This is the opposite of what using the RF gen. shows. Don't know why the difference.
Steve D
However when I touch first the antenna terminal and then the grid of the 6A8, making my body an antenna, the signal level is much higher when I touch the grid of the 6A8. This is the opposite of what using the RF gen. shows. Don't know why the difference.
Steve D
