Good day peeps
I have a Pass Aleph 5c kit amplifier on the bench of a friend.
It has an unacceptable high hum on the speaker outputs.
There is virtually zero DC offset. Grounding was done according to all the tried and tested theories (including referencing to Douglas Selfs writings).
The hum is present when the inputs are shorted and also when the ground is lifted.
Any pointers...?
I have a Pass Aleph 5c kit amplifier on the bench of a friend.
It has an unacceptable high hum on the speaker outputs.
There is virtually zero DC offset. Grounding was done according to all the tried and tested theories (including referencing to Douglas Selfs writings).
The hum is present when the inputs are shorted and also when the ground is lifted.
Any pointers...?
Is an output signal present, if you feed an input signal ?
In general there are two sources of hum, as long as the dc conditions in the circuit are correct:
faulty power supply
faulty GND-management
Please upload the schematic of GND-management.
In general there are two sources of hum, as long as the dc conditions in the circuit are correct:
faulty power supply
faulty GND-management
Please upload the schematic of GND-management.
