DIY - Change capacitors

DIY - Change capacitors - Quad 405

DIY - Change capacitors - Quad 405


Schematic of quad 405

Service Manual


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Serial 56582 Board M12368 ISS 10

The device is restored without making any changes to its design. It's a Excellent device whose Musicality is still at the top Today. This device Works with speakers Brand Elipson, 3 channels, bass reflex.
Great consistency of the stamps, the sound scene is ample and without aggressiveness of the treble. A quality vintage amplifier.

DIY - Change capacitors

Purpose of the operation: Complete renewal of electrochemical capacitors. Cleaning the knobs and different contacts. Note: For marking of components on the PCB, they can be wrong. Do not overheat welding because the tracks tend to peel off.


quad 405

quad 405 restoration

quad 405, old components

quad 405, old components

Results: The review was well needed. The capacitors 100/16 and 47/40 were defective. One of the 2 capacitors of 10.000 µF was defective. If you look at the photograph, the top of the component is pierced. Imagine the change in the sound level!



quad 405 restoration

quad 405 restoration

quad 405 restoration

Film capacitors have Kept very close values.


I changed them despite everything hoping
to improve the sound restitution.

quad 405 restoration

quad 405 restoration, capacitor adaptator

Adaptation with printed circuit board on capacitors "SNAP-IN". Adaptation for their fastenings with PVC plumbing pipe diameter 50.

quad 405 restoration



quad restoration

quad 405 restoration

quad 405 restoration

quad restoration

quad restoration

Download M12368-ISS9-10 Schematic


quad restoration - PCB MJ 12368 ISS 10

Beware this pcb does not have the original plot