Fox 460 Circuit Kit

The "Fox 460" kit is our 3rd-generation tube mic upgrade for the Alctron T11-A, Apex 460, Carvin CTM100, BadAax T11A, and clones. Based on a circuit design by Fox Audio Research, this kit replaces 100% of the audio signal path of the microphone: capsule, impedance conversion circuit, tube, and transformer. The modded mic has excellent performance specs for sensitivity, noise, and distortion; its frequency response can be personalized at build time to mimic landmark vintage microphones. The Fox 460 mic will compete easily with commercial products costing 3-5 times more. We revised and improved this circuit in January, 2022, to incorporate four upgraded capacitors, notably including the tube cathode capacitor. The board layout and build process were refined, along with the documentation. Capsule Choices It might be tempting to pick a cheap capsule from Reverb or Ebay. We advise caution, having diagnosed far too many bad-sounding customer mics whose cheap capsules ruined the project. The