Another grounding issue I had was from the cable TV box. There was a splitter on the outside of the house, which needs to be grounded and it was, to the steel conduit/ main breaker panel just above it. But, that grounding clamp and steel pipe had been painted so it wasn’t making a good bond. The resistance from the splitter to the pipe should have been 0 Ohms, but it was measuring about 10 ohms iirc, which isn’t much, but it was enough to cause the cable box to hunt for a better ground inside the house, inducing some hum. Once I cleaned everything with a wire brush on the outside of the house and got a good bond measuring 0 Ohms, the problem was solved.
This 60 Hz hum is driving me crazy
I just got a new to me, Prima Luna Prologue Premium Integrated tube amp. Sounds great, but there is a "ear to the speaker" 60 Hz hum. Hum sounds the same if I adjust volume +-/ The only thing I have connected is a Parasound Zdac. Speakers are Rega RS1 Here is what I have tried:
1. I disconnected the Zdac so it was just the PL connected to the speakers with no other inputs. Hum still there.
2. While Zdac still disconnected, I use a 3-to-2 prong adpater to determine if its a ground loop. Still there.
3. The outlet is a new one added from our remodel. So I used an extension cord and plugged into an original outlet to see if the electricity was "dirty." Hum was still there.
Now here some possible culprits.
* The stereo is perhaps set up in the smallest man cave in California. The speakers are about 2 feet away from preamp. I will try moving speakers further.
* I am using crappy Amazon 12 AWG cables. I have some better ones coming from Morrow Cables.
* The stereo is in front of the panel that our internet wiring comes in through (I am in a condo complex). There is no wireless there, but perhaps I should set up system somewhere else to try.
* I am using the tubes from the previous owner...do I just buy a set of new tubes?
Is there anything else I should try? Thanks in advance.
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- 43 posts total
- 43 posts total