Hi.
Somebody know, why when i put music in my tube amp with my notebook and an the external audio board, there is voltage when i touch the case of my computer?
And, when i connect the third wire from the power cable to the amplifier chassis the Jump the Breaker security key.. As long as I don't connect the third wire to ground the amplifier works fine...
Somebody know, why when i put music in my tube amp with my notebook and an the external audio board, there is voltage when i touch the case of my computer?
And, when i connect the third wire from the power cable to the amplifier chassis the Jump the Breaker security key.. As long as I don't connect the third wire to ground the amplifier works fine...
The notebook probably does not have a 3-pin power plug, but has two capacitors to divert RFI. This makes the notebook "float" at about half of the wall voltage, about 60V in my 120V house.
Is a "Jump the Breaker security key" a shock prevention circuit-breaker, GFI or RCB? The stray leakage from the RFI capacitors in the notebook are selected to not deliver a "deadly shock", and "should not" trip a shock protector.
Is a "Jump the Breaker security key" a shock prevention circuit-breaker, GFI or RCB? The stray leakage from the RFI capacitors in the notebook are selected to not deliver a "deadly shock", and "should not" trip a shock protector.
When i connect the 3th cable of tube amplifier from chassis to ground, on shock prevention circuit-breaker.
If the tube amplifier is not using a 3 wire connection from the power mains, then . . .
Measure the AC volts from the tube amp chassis to the power mains ground.
What tube amp?
Please post a complete schematic of the amplifier, especially the complete power mains circuits, power transformer, and the connections to the chassis.
Are all the signal sources using 2 wire connections to the power mains.
Example: Wall Wart transformer power supply, Wall Wart switcher supply, etc.
Then measure the AC volts from the signal sources signal common output to the amplifier chassis.
There might be a failed component (short), or a wire or other connection that has shorted to where it does not belong.
Are you running the Notebook with its switcher supply connected to the power mains?
Are you running the Notebook from its batteries, and not from the power mains?
Also, what is the external audio board? Please describe it.
Is it powered from the power mains? 2 wire, or 3 wire?
Can it be powered by a battery.
Solve this problem.
Safety First!
Prevent the "Surviving Spouse Syndrom"
Measure the AC volts from the tube amp chassis to the power mains ground.
What tube amp?
Please post a complete schematic of the amplifier, especially the complete power mains circuits, power transformer, and the connections to the chassis.
Are all the signal sources using 2 wire connections to the power mains.
Example: Wall Wart transformer power supply, Wall Wart switcher supply, etc.
Then measure the AC volts from the signal sources signal common output to the amplifier chassis.
There might be a failed component (short), or a wire or other connection that has shorted to where it does not belong.
Are you running the Notebook with its switcher supply connected to the power mains?
Are you running the Notebook from its batteries, and not from the power mains?
Also, what is the external audio board? Please describe it.
Is it powered from the power mains? 2 wire, or 3 wire?
Can it be powered by a battery.
Solve this problem.
Safety First!
Prevent the "Surviving Spouse Syndrom"
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