JBL Noise Gate
Not much is documented about a standalone JBL noise gate. The record is thin. There is no specific model number, no production years, no specifications, and no confirmed manufacturer listing beyond the brand name and product type. What the archive can confirm is this: JBL did market signal-processing gear for the professional and project-studio markets during the 1980s. A period listing in db Magazine (November 1988, p.52) placed JBL noise gates in the SG series - the SG-33 (two-channel) and SG-35 (four-channel) - alongside the CG-85 gated compressor-limiter. That listing described fast attack times (10 microseconds), a 60 dB threshold range, stereo tie patching for tracking multiple gates, balanced or unbalanced input operation, bypass switching, and a two-stage release circuit. Prices were $399 for the two-channel unit and $599 for the four-channel unit.
Past that single trade listing, nothing survives in the record. There is no circuit topology, no frequency response figures, no dimensions or weight, no user reviews, and no production timeline. Whether JBL built these units or rebadged them from another manufacturer is not documented. If you own an SG-33, SG-35, or any JBL-branded noise gate, the archive would welcome photographs and any markings that might pin down the OEM and build date.
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