Neumann SM69 FET
A stereo condenser that a 1971 British price list valued at £215 - roughly three times the cost of a single-capsule KM84 sitting beside it.
Overview
Two hundred and fifteen pounds. That's what Neumann's UK distributor, F.W.O. Bauch Ltd., printed against the SM69 FET in a 1971 Studio Sound equipment listing. The same page priced the KM84/85 at £70 and the KM83 omni at £65. The SM69 FET cost roughly three times either of them, and a little over three and a half times the £59.80 KMA-S7 at the bottom of the range. Nobody bought this on impulse for a project studio. It was a capital instrument.
What that money bought was a stereo microphone: one body carrying two capsules in a fixed arrangement, with the price list's "stereo" designation set beside the pattern column. The 1971 listing gives the pattern options as omni, cardioid, and figure-of-eight, the sensitivity as 22 mV/N/m³, and the source impedance options as 50 or 200 ohms. Collectors who have worked with the FET80 series note that the pattern flexibility is the point of the design: a crossed pair that switches between the three classic polar responses without swapping capsules.
Recording Engineer (April 1984, p.120) singled out that versatility when it called the SM69 FET "an exceptionally versatile microphone." It also offered a frank dissenting opinion on the voicing, describing a "rather bright quality" that the reviewer attributed to the older capsule and housing design. It was not the reviewer's personal favorite, and the review says so plainly. The same review notes the U89 as having slightly more high-frequency emphasis than the TLM170, so the SM69 FET sits in a family of Neumann FET voicings rather than standing apart as neutral.
By the late 1980s the price had climbed steeply. A 1990 Studio Sound dealer listing shows the SM69 FET at approximately £1,827, against £1,055 for a TLM170 or a U87ai, and £2,027 for the USM69i. Nearly two decades of inflation and currency movement account for part of that, but the ratio to the single-capsule Neumanns held: the stereo body stayed roughly twice the price of a mono studio condenser.
Studio inventories show it stayed in daily use. A facility gear list published in a period EQ magazine roster places an SM69fet alongside an M49, U48, U67, and multiple U87s - the stereo mic in the same cabinet as the classic tube and FET mono workhorses, not relegated to a spare. The natural job for it is the coincident pair for a choir, a piano, or a hall, with the mono mics covering spots.
What to watch for on the used market is mostly what the period sources imply. The microphone depends on its dedicated power supply and pattern box. The 1974 Nagra account makes clear the phantom supply and polar-diagram box are integral to operation, so a body without its supply is an incomplete instrument. Confirm the supply is present and functional before valuing a listing. The capsule and housing are old enough that the 1984 review attributed the bright character to their age, which suggests any example's voicing may have drifted from original. And the 1971 figure of 22 mV/N/m³ is a modest sensitivity by later standards, so expect to lean on a quiet preamp - the same low-noise requirement the 1972 hall recording made plain.
The SM69 FET is a single-body stereo condenser from the FET80 era, priced in 1971 at £215 and still catalogued in 1990 at around £1,827, with three switchable patterns, 50/200-ohm source impedance, and a documented place in orchestral and organ recording. One reviewer called it bright, and the same reviewer called it exceptionally versatile. It was also quiet enough that the BBC's engineers preferred it to an AKG C24 for relay work.
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