Welcome to Watford Valves

Watford Valves is a U.K company that was established in the early 1990s’ and has become one of Europe's leading suppliers of tested, graded and guaranteed valves and components to the professional music and audio industry.

Watford valves through its unique valve test equipment offer the most comprehensive and thorough valve test facilities on valves available today. Watford valves are the only company to offer full drive tested signal valves and burst tested output valves under the Harma valve range.

"Watford Valves, with the aid of its custom-built test rigs, puts the valves under ’real working’ conditions which is the equivalent of a hellish week with the US Navy Seals"
Ben Bartlett, Guitarist, Feb. 2001
Watford Valves "runs them through more checks than any other facility in the world"
Dave Hunter, Guitar Magazine, Nov 1999
Unique Advice

Watford Valves is unique in the fact that it offers advice on how the valve sounds in its particular application and helps the customer get the right valve for your musical style or application. This experience has been gained from over 30 years of playing and using valve equipment in both live and audio applications. Many valve resellers offer a limited choice of stock, and some even offer just one factory brand and try and claim that the make is the best across all valve types.

In order to provide the advice you need to have the correct item in stock. So Watford holds a large and comprehensive inventory of high quality new old stock and current production valves for the professional music and audio industry. All items that we stock must meet our stringent standards for sound quality and reliability. Being musicians and users of valve amplifiers all valves are assessed in real working conditions as to their actual sound. This allows us to advise you of the right valve for your amplifier and your sound. Our in house testing procedure ensures that you get the right quality first time.   

Watford valves client base is worldwide and covers the world’s leading recording studios, international recording artistes, tour and hire companies and the individual musician. With the aid of our custom built test rigs, we are proud list the following clients; AC/DC, Abbey Road Studios, Eric Clapton, Brian May, The Darkness, Franz Ferdinand, Oasis, Manic Street Preaches, My Chemical Romance, Joe Satriani, Iron Maiden, Radiohead, Sex Pistols, Sony Studio’s, Thunder and the ‘We will rock you shows’ Worldwide.

Watford Valves are the first company to introduce Cryogenic treatment on an established brand. To read more about the Harma Cryogenic range and this revolutionary treatment select the Cryogenic section from our products menu.

To navigate our website please use the menu above. We hope you enjoy using our website and if you have any comments, please email us or visit our Facebook page.

The Mullard story, see how these great valves were made.
Testing Times

Latest information



***Harma Vintage 12AX7WA & 12AX7WA Balanced ***

*** Harma Vintage 12AX7WA & 12AX7WA Balanced Cryo***




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We are receiving an unprecedented number of valve orders due to supply issues caused by Russia blocking the export of electronic goods.
Please therefore bear with us, we are doing our best to meet demand, but orders will take longer to be dispatched. Thank you for your patience.