EARTHQUAKER DEVICES PLUMES Devices Plumes No Audio Led On

100uF 25V Electrolytic Capacitor

Research indicates this specific capacitor is prone to thermal failure and shorting in the Plumes circuit. When this component fails, it shunts the internal voltage rails to ground, preventing the op-amp from processing audio signal. The status LED remains on because it is powered by the initial 9V input stage prior to this filtering section.

TC7660H Charge Pump DC-to-DC Converter

The Plumes uses a charge pump to create symmetrical power rails for its audio path. If this IC fails due to voltage spikes or internal latch-up, the +/- 9V rails will collapse, resulting in a 'no audio' state. This component is the primary active device responsible for the pedal's internal power management beyond the basic 9V input.

TL072 Dual Operational Amplifier

The TL072 is the central 'brain' of the signal clipping and amplification stage. While less likely to fail than the power supply components, a catastrophic failure of the op-amp will break the signal chain entirely. If the power supply components are verified as functional, a dead op-amp is the next logical failure point in the audio path.