Now testing the PHONO inputs, "MAG-2" on this kx-200. I can't get it to sound as full as with signals played through AUX-1. And when I turn the volume to max with no signal source (turntable cables unplugged), I'm getting a low-frequency click every 1/2 second. And then sporadically I get some noise that lasts about 1 second and that sounds like the alien in the movie "Annihilation". And the alien is coming out much louder from the right channel. And then there's the requisite 120Hz hum in both channels. I unplugged everything, only speakers are plugged in and I still get the noise when on MAG-2. I get it on MAG-1 also. TUNER is dead quiet as are AUX-1 and AUX-2. So this is noise in the 2 MAG circuits. Then I tried different tubes, Genalex B759 gold pins. With those I get white noise out of both channels. Weird. Trying different tubes, now they all produce white noise, louder in one channel. Tried some old old RCA tubes and... alien is back !