TOP250 & tube amplifier
Posted by: stellarsoundlabs
on
I am diagnosing a regular, audible clicking sound coming from this IC in a small desktop tube amplifier. Even after replacing the IC, the new one clicks as well. No schematic is available for this unit so I am at a loss. I'm a junior audio electronics repair tech with proper bench equipment. Any advice would be appreciated, thanks
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This appears at first glance as if the TOPSwitch is operating in autorestart protection mode due to a fault somewhere else in the power supply. Some possible culprits might be an output short or perhaps dried-up output capacitors. To start with, you might want to monitor each of the output voltages with an oscilloscope to see if they at least try to start and regulate.