[TV MAN]

I had a thread about one I purchased off Ebay, but cant find it now. It used a 6SA7 output/mixer and a 12AU7. It worked very well and didnt pick much hum. It was a simple circuit. I also experimented with a mic oscillator, very little hum, but terrible sound quality. I think it depends on a lot of factors, including power output. My A/C power has been pretty lousy since our power company changed to a smart meter from the old style. Everything effects the signal, from the ground up.