@ZapTruths@bhasan77@cqcqcqdx My Fluke measures pure resistance not impedance Z. Also just DC resistance not AC .
Anyway, it’s the current that shock’s not the voltage.
@elormkdaniel The preamp was not HF decoupled and when a phone started to transmit at an incomming call the preamp amplified the induced HF signal and worked as a demodulator by bad design. The HF demodulated signal was amplified and output by the speaker.
@Tammie1808 Wat ik bedoel is dat je aan een koppeling geen onderhoud kunt doen behalve dat je zelf zo weinig mogelijk de koppeling moet laten slippen dus opletten met schakelen en optrekken.