Langevin EQ-252 (c. 1961)
Almost nothing is documented about the Langevin EQ-252 beyond the company's own advertising. The surviving record is a full-page ad in Audio (August 1961, p.9), repeated in the November 1961 issue. It introduces the "EQ-252-A" as a graphic equalizer aimed at recording, TV-broadcast, and motion-picture work. These are manufacturer ads, not independent reviews, so the claims are Langevin's own. They are also essentially all there is.
The ad described seven selected positions of variable hi-lo equalization and attenuation, with 8 dB of equalization. Listed specs: a bridged-T circuit, 600/600-ohm impedance, 16 dB insertion loss, and an operating level of -70 to +24 dBm.
Known specs from the 1961 ad:
- Model as advertised: EQ-252-A
- Type: graphic equalizer
- 7 selected positions of variable hi-lo equalization and attenuation
- 8 dB of equalization
- Bridged-T circuit; 600/600 ohms
- Insertion loss: 16 dB
- Operating level: −70 to +24 dBm
That is about all the record shows. No production dates, original price, or independent test reports have surfaced.
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