Common name: Royer Labs SF-24V
Production Status: In production
The SF-24V is a vacuum tube stereo 1.8-micron ribbon microphone. The microphone uses the same proprietary tube electronics as in the R-122V ribbon microphones. The SF-24V’s independent tube circuits provide an output level of -38 dB with a self-noise of less than 18 dB. Like an SF-12, the SF-24V is actually two matched ribbon microphones, placed one above the other in a coincident pair, each aimed 45 degrees from centre in the classic Blumlein configuration. The SF-24V’s twin head amplifiers consist of low-noise, triode-connected military grade 5840 vacuum tubes. The SF-24V’s triode-configured cathode follower circuitry enables the microphone to drive long cable runs without sonic degradation or high-frequency loss. This capability is further enhanced by the SF-24V’s dedicated power supply, which provides ample current to the vacuum tube electronics. Induced noise is virtually eliminated by the microphone’s fully balanced outputs, which are electrically isolated with special purpose Jensen output transformers. The SF-24V’s higher sensitivity creates no additional self-noise. All of the SF-24V’s increased level comes from its large, specially wound toroidal transformers. The tube system operates at less than unity, adding no noise of its own. The SF-24 is ideal for recording full orchestra, choir and ensembles, classical piano, drum overheads, acoustic instruments, small vocal groups, percussion instruments and ambience. Each side of the SF-24V can also be used as an independent mono microphone. The microphone includes a carrying case, wooden box, shock-mount, microphone sock, power supply, 7 pin XLR cable, power cord and cable ties.