Mullard Mustard Capacitors, Fueling Classic Circuits
Since 1957

Thanks for stopping by MustardCapacitors.com, the gathering spot for anyone fascinated by the famous yellow Mullard Mustard capacitors. Here you’ll find lively posts on their origin story, the sonic character they add to tube gear, clever repair tricks, and a growing registry of amplifiers, radios, and studio consoles that carried them from factory floor to concert stage.

Our writers document every corner of mustard-cap history: production runs at Philips and Valvo, NatLab research notes, advertising claims from the late-1950s, and the gradual switch from green epoxy to the warm yellow hue that earned the “mustard” nickname. We shoot macro photos of internals, publish history, and share circuit diagrams that show exactly where these film-and-foil gems sit in tone stacks, EQ networks, and power-supply filters. Fresh articles land frequently, giving you new data points and stories to read, bookmark, link, and share with other restorers.

This site works hand-in-hand with ElectronicParts-Outlet.com, supplier of genuine new-old-stock Mullard mustard capacitors. Our sister shop keeps a full shelf of values from a 1,000 picofarads up to microfarad sizes, in working voltages that match guitar amps, vintage hi-fi, and broadcast consoles. Parts ship worldwide within one business day, so builders and bench techs in any country can keep classic gear singing without compromise.

Community sits at the heart of MustardCapacitors.com. Readers send photos of rare chassis stamps, upload spectrum plots after capacitor swaps, and debate whether polyester film really delivers a smoother high-mid roll-off than polypropylene. If you have a story, lab result, or restoration gallery, tap the Contact link and say hello. Guest posts, circuit write-ups, and candid feedback all get published with a byline, giving credit where it belongs.

Settle in, explore the archive, and join thousands of hobbyists, engineers, and musicians who keep the mustard-cap legacy alive, one bright yellow cylinder at a time.