PilotSkier wrote:Due to a death in the family, I had to place all of my projects on hold; thus, I still am looking for scrap metal dealers as a source for the requisite aluminum plate. After reading the second to the last posting, I just thought it informative that B&K never warned its consumers during that time period about the potential for hum. I still have the original manuals and marketing brochures and separating components to prevent hum or interference was never mentioned. In fact, B&K's sales brochure shows the pre-amp sitting directly on top of the power amp. I should also point out that both units are designed to be "rackmounted."
I am sad to hear of your loss. Your family issues now are certainly more important than audiophile tinkering other than what is necessary for your therapy.
It is possible that the power transformer in your amp leaks more flux than typical. Some years back I worked on a Carvin mixing board. It had hum due to leakage from its power transformer. I had a toroid built to replace the OEM E-laminated transformer. That gave me a 13 dB improvement in the hum level. While Carvin isn't the highest level stuff I can't believe the the board I was working on was typical.