[jcassity]

Interesting (but annoying) problem. When the noise changes during the day, how rapid is the change? Does it fade out over 1/2 hour, change pitch or tone, or drop out suddenly?

That might provide another clue.

Ed

i think i know where you are going, thought about that also

update,,, the noise slowly faded out at around 8pm, then around 8:30 hardly any noise then just now leaving the garage (doing an 87 cougar resto), the noise was barely noticeable.

never had this issue during the winter,,, i think i noticed it last summer but was very new  to tube radio tech and resto then. this is only my second summer running tube radios. my 46-1226 & my AA5 S38-d hallicrafters both do the same thing.

I can easily move the antenna, thinking of not using the pole on my chimney, just omitt that and continue the wire up into the tall maple with a weight, its another 30ft higher.

the reasons i think its sun related is that my upper story dormer roof line is darn 'near' optiimal for my location at 17deg for solar panels.