hillbilly3302 wrote:
Hi ED, thanks for the response.... yes its a Mech. hum, I have never
put it on the air. I bought it from an estate and when I fired it up I
noticed the hum when I turned on the HV switch.... it has the solid
state recitifer replacements and 4 brand new 811's I doubt I ever use it
and I'de like to get my $250.00 back out of it...lol

Any chance it's just the power transformer laminations vibrating?

--
"There are three types of people in this world - those who see the light,
those who don't, and those who get a brief glance of it just as I slam
the door in their face"