BBC ME-12/9
The BBC's peak programme meter design that didn't stay inside the corporation. A licensed drive circuit from it ended up in studios, transmitters and rack rooms across Europe.
Overview
The ME-12/9 is a BBC peak programme meter design. It didn't stay a BBC in-house instrument. The corporation licensed the design out, and by the late 1970s a small British firm called Surrey Electronics was advertising a "PPM2" drive circuit built "under licence from the BBC" and explicitly "based on the ME12/9." That licensing trail is the clearest documentation of the ME-12/9's existence and its role. It was the reference circuit other manufacturers pointed to when they wanted a meter that behaved the way broadcasters expected.
The licensing came down to the meter's ballistic behavior. The PPM2 advertising copy, for the same drive topology derived from the ME-12/9, describes a display with "fast but defined attack, slow fall-back, uncluttered logarithmic scaling and a white pointer on a matt black background." The needle has to jump to the peak quickly enough to catch transients, then fall back slowly enough that the operator's eye can read it. Pointer instruments, the same copy argues, remain unmatched for "easy perceptibility" because the meter arc moves against a field of view full of straight lines.
The ME-12/9's specifications became a benchmark that outlived the original hardware. The licensed PPM2 derivative is described as meeting BS 4297, the proposed revision of BS 4297, and the proposed IEC Type 2 meter specifications, while fulfilling the requirements of the BBC, IBA, EBU and BPO. Later advertising for the same licensed circuit cites IEC268-10A and draft BS54/8 instead, and lists approval "for critical programme monitoring by IBA, EBU and BPO." The standards citations shift across the years as the specifications were revised, but the ME-12/9 sits at the root of all of them.
Studio Sound (February 1977, p.56) reviewed the Radford distortion measuring set in the same issue where Surrey Electronics was advertising its BBC-licensed PPM circuit, a reminder of how tightly the British studio-equipment trade of the period clustered around a handful of small firms building to broadcast standards. The ME-12/9's influence ran through that trade — a BBC design that a Cranleigh workshop could build under licence alongside the corporation's own engineering.
One detail for anyone chasing the design: the licensed derivative added an electronic floating input that would "withstand mains or static voltages on the signal lines." That was layered on top of the ME-12/9's own input arrangement. It suggests the original BBC circuit did not include that protection, and that the floating input was Surrey's contribution rather than the corporation's. Anyone working on genuine ME-12/9 hardware should treat the floating input as a derivative feature, not a baseline.
The meter movements were a separate supply chain. Surrey's advertising repeatedly names Ernest Turner movements - types 642, 643 and TWIN - as the pointers that went with the licensed drive circuit, with flush-mounting adaptors and illumination kits available for the 642 and 643. The TWIN was a flush-mounting type in its own right. The available material doesn't document whether the BBC's own ME-12/9 installations used Turner movements, but the licensed ecosystem certainly did. Anyone assembling a period-correct PPM rack today will run into those movement types constantly.
Surrey also sold a "sum and difference changeover board" designed to suit either the PPM2 or the BBC ME12/9. That implies the ME-12/9 was still being installed in working studios well after the licensed derivative appeared. By 1980 it wasn't a museum piece. Accessories were still being built around it.
The available documentation leaves a lot out. There is no confirmed date of introduction, no production run, no original price, no physical dimensions, no weight, and no collector market data in the source material. The ME-12/9's identity as a BBC peak programme meter design is well established through the licensing trail, but the instrument itself - the chassis, the build, the units that survive - remains thinly documented. Anyone with a genuine ME-12/9 rack unit, or a service manual with the BBC type number on the cover, could add to the record by putting it in front of an archive.
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