Parts ConneXion Parts ConneXion
In exclusive partnership with top-tier modification house Parts ConneXion, Underwood HiFi is proud to offer the following carefully tested, factory-authorized performance enhancement packages for the Quad QC-24 and Quad 909.

By virtue of selling consumer-direct, we can offer these super-charged, brand-new models for a better price than the same modifications would cost retro-fitted - though we offer that, too.

Table of contents

Quad QC-24

The Quad QC-24 is a wonderful $1,250 tube preamplifier from one of longest-lived, most famous names in High-End audio. It is a Golden Ear Award winner in The Abso!ute Sound. Our mod takes it to the next level and allows it to compete with anything under $3,000.

Sonic changes of our Level-1 mod

Quad 909 The Quad 909 power amplifier is a wonderful 140wpc power amp (250 watts into 4 ohms), with a midrange unsurpassed in its price range which The Abso!ute Sound review compares to $4000 tube amps.

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