A fault in one of the EL34 output valves caused the failure of this Ming Da MC34-AB amplifier. As a result of the fault some resistors overheated and the resultant smoke and fumes contaminated the valve base and damaged some of the heater wiring.
Removal of the contamination from the valve base, replacement of the faulty resistors and heater wiring, a new set of valves and adjustment of the bias restored normal operation.
Click on any gallery image to view it in high resolution.
-
- Ming Da MC34-AB – Excellent
-
- Under Chassis View of Faulty Ming Da MC34-AB Amplifier
-
- Damage Around EL34 Output Valve
-
- MC34AB EL34 Valve Base Removal
-
- Contaminated EL34 Valve Base
-
- Stripped Down EL34 Valve Base…..after cleaning
-
- EL34 Valve Base After Cleaning
-
- Under Chassis Ming Da MC34AB restoration
-
- Ming Da MC34AB with new EL34 valves fitted
-
- Ming Da MC34AB Post Repair