Loud humming coming from one BHK 300 mono at start-up

[watchdog507]

It’s here:

BHK 300's are back

As some of you may know, one of my BHK 300’s developed a persistent sound that resembled static. After a trip to Boulder, my misfiring amp has a new input board. While it was away, I decided to buy upgraded fuses. I went with HiFi Tuning Supreme’s. In total each amp has 6 fuses. This is not an insignificant upgrade. I considered the SR Blues, but my ears can’t really tell the difference compared to the HiFi Tuning Supreme’s. I have a good source, that kept the costs fairly reasonable. Th…