Beta 3 U15a Service Manual | High-Quality ✧ |

Required: Audio signal generator, oscilloscope, multimeter, 8Ω dummy load.

Unlike a passive speaker, the U15a’s amplifier includes potentiometers for HF trim and overall gain. The service manual provides the to set the correct bias current for the output transistors. Guessing these settings leads to thermal runaway or asymmetric clipping. Beta 3 U15a Service Manual

Thermal ShutdownEnsure the rear heat sink is not obstructed and has proper airflow.Check for dust buildup inside the module which can insulate heat. Assembly and Disassembly Tips Required: Audio signal generator