Quad 303 Upgrade and Revision kit

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Everything you need to do a full revision of your 303 yourself!

Illustrated step-by-step instructions & schematics online.

7/7 help via e-mail

Audiograde high-end caps for the circuit-boards

Audio-grade resistances for the power-supply

Top-quality 4700MF 100 Volt capacitors for the power supply and for the outputs.

The kit includes several other components like diodes, trimmers and cabling

You can download the 303 Upgrade / Revision manual from the Download section.

If your Quad 303 is version 1 (serial number below 11500) or if the boards are damaged or burned we recommend using the High-End kit with new boards:




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