Well folks, as we use to say at the Telephone Company (I retired with 32 years), "the trouble came clear while testing" although it wasn't that simple. I took the body shell off to do a hard reset using the reset button on the circuit board, CV8 set to 8, didn't seem to do anything. While in there I found some pinched wires, and I looked at the circuit board for debris, wire clippings, etc, but found nothing definitive. Track test, sound still there, sh**! The buzzing/HF sound had to be coming from the front speaker (two speakers, front and rear), because the circuit board is in the rear. So I decided to take the front speaker out. I blew it out with a photographers blower brush. It's low pressure and wouldn't damage the diapham, I hoped. I couldn't see anything in the speaker, but there may have been something in there. I read while searching for a solution, that anything on the diaphram can make all kinds of terrible sounds. Track tested the chassis without the body shell, the sound was gone. There's still a little "hiss", but the Broadway E-6 and E-7 sound about the same. The body shell back on, still good. Time for a "drink" goodnight!
