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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: