[morzh]

1. Listening to it more I realized that the distortion similar to 90 and 20 is still there, just less pronounced, but recognizeable.
I am not willing to mod the detector - the radio will loose quite a bit of sensitivity. I compared it to the 90 - right now it is lot more sensitive.

2. Alluvasudden when turning it on I did not hear the transformer buzz. Then after 10 minutes I heard a little. So I decided to experiment: plugged it into the Variac and set the volts to 110V. When the voltage remains under 115V there is no buzz. But as son as it reaches 117-118V I hear the buzz and at 120V it is quirte pronounced. Even though I do not think it should buzz at 120V all the more reason to install buck transformer.