Quad 303 all versions illustrated upgrade guidelines V2.0
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Quad 303 all versions illustrated upgrade guidelines V2.0
Including installing HE boards
These are the illustrated step-by-step guidelines for upgrading your Quad 303 with
the Dada Electronics upgrade-kit.
First of all, thanks for your purchase of our upgrade kit! Hereunder, you will find the
step-by-step guidelines for upgrading the Quad 303 amplifier to modern, high-end
standards. A word of advice: be sure to always watch the polarity of all diodes,
zeners & electrolytic capacitors mentioned, and strictly follow the steps described in
these guidelines!
There are in fact three versions (as far as we now until now) of the Quad 303. The
first two versions (up to serial no. 11500) have different driver boards. Make sure you
use the schematic that corresponds with the version you have. You will find the
schematics and the service manual in our download section, the information from the
service manual and the diagrams will not be repeated in this manual. We cover all
the versions with one kit. Only RV101 is different and will be delivered in two values!
We do not advice to revise boards older than version 9, although it can be done, the
quality of the boards is too low in most cases and there are circuit changes. Instead,
purchase our HE boards or already revised version 10 boards.
DaDa Electronics
