An Update - which I hope is final.
The hum doesn't appear to be grounding related. Instead, it appears to be thermal in nature. If I turn off the amp, but leave the preamp powered up, there doesn't seem to a problem. For 2 days in a row now, there's been no hum.
If it ain't broke, I won't fix it.
Thanks to those who helped.
Lee
The problem appears
The hum doesn't appear to be grounding related. Instead, it appears to be thermal in nature. If I turn off the amp, but leave the preamp powered up, there doesn't seem to a problem. For 2 days in a row now, there's been no hum.
If it ain't broke, I won't fix it.
Thanks to those who helped.
Lee
The problem appears