Vett93
This new post of yours has a lot more going on than the original (ground rod placement and ways to minimize noise). And by the way, everything I suggested was from personal practice after consulting EEs and Union Electricians. Being a retail pharmacist has it's advantages, I get to know a lot of knowledgeable people and pick their brains.
Why do you think your secondary power amp hummed when the signal ground was isolated from the chassis?
If I'm reading you correctly, the chassis of your secondary power amp was internally connected to the input signal ground as well as the power ground. When you isolated the input signal ground from chassis (and AC ground), the hum disappeared. How did you do this? If I read you literally, you were able to do this while leaving the AC ground still connected to chassis. I have seen equipment with "ground lifting" switches, but never used one in practice, nor do I fully understand it. Perhaps another reader can explain further.
Have you been able to obtain schematics of your equipment?
Did you open it up to verify that the power was proper polarity with regard to hot and neutral? Have you checked for leakage?
What equipment do you have exactly? Perhaps other readers have had personal experience. I read a post a few weeks back regarding a preamp/poweramp mismatch. Without getting specific, the two were literally oil and water, one passing DC to another unable to handle it. Perhaps your situation is basic design incompatibility.
I'm no EE but I have built a few kits, fixed a few rigs, and can read schematics well enough to trace a circuit.
Please provide more specific information, I'm intrigued.
This new post of yours has a lot more going on than the original (ground rod placement and ways to minimize noise). And by the way, everything I suggested was from personal practice after consulting EEs and Union Electricians. Being a retail pharmacist has it's advantages, I get to know a lot of knowledgeable people and pick their brains.
Why do you think your secondary power amp hummed when the signal ground was isolated from the chassis?
If I'm reading you correctly, the chassis of your secondary power amp was internally connected to the input signal ground as well as the power ground. When you isolated the input signal ground from chassis (and AC ground), the hum disappeared. How did you do this? If I read you literally, you were able to do this while leaving the AC ground still connected to chassis. I have seen equipment with "ground lifting" switches, but never used one in practice, nor do I fully understand it. Perhaps another reader can explain further.
Have you been able to obtain schematics of your equipment?
Did you open it up to verify that the power was proper polarity with regard to hot and neutral? Have you checked for leakage?
What equipment do you have exactly? Perhaps other readers have had personal experience. I read a post a few weeks back regarding a preamp/poweramp mismatch. Without getting specific, the two were literally oil and water, one passing DC to another unable to handle it. Perhaps your situation is basic design incompatibility.
I'm no EE but I have built a few kits, fixed a few rigs, and can read schematics well enough to trace a circuit.
Please provide more specific information, I'm intrigued.