GML 8306 – 6-Channel Reference Class-A Microphone Preamplifier is a used item in very good condition, listed on Reverb. The asking price is £3,476. It is offered by Apollo Audio through Reverb. Local pickup is available. It is in our Preamps & Channel Strips category. Used Gear Hunter first saw this listing on 4 November 2026 and last saw it on 10 November 2026. It has been seen 14 times in our scans. Prices are converted from the seller's currency when we scan the listing, so the amount you pay may differ slightly. The seller sets shipping, and import duty or VAT may apply, so check the final cost and the item's details on Reverb before buying.

From the seller

Functional, all six channels clean and quiet Light rack rash above top screw holes Non-smoking private studio, never toured What’s Included GML 8306 2U preamp GML 8355 external ±28 V PSU Original 5-pin DC umbilical (1 m) Key Features / Specs George Massenburg design – discrete Class-A bipolar topology with DC servos 6 identical channels, Grayhill 12-position gain switch, 15 – 70 dB in 5 dB steps (±0.25 dB) Frequency response: ±0.3 dB, 1.7 Hz – 260 kHz CMRR: ≥ 80 dB @ 100 Hz & 10 kHz EIN: –126.5 dBu (150 Ω); Max output: +27.4 dBu Transformerless electronically balanced inputs; earth-compensated unbalanced outputs (Pin-2 hot – do not short Pin-3) Independent 48 V phantom switches per channel, red clip LED at +24 dBu Rugged external PSU can daisy-chain up to 3 GML units Excels as ultra-transparent front end, line-driver over 300 ft multicores, mastering capture, classical & acoustic sessions Cosmetic Notes Minor rack marks (see photos) Slight discoloration on PSU face (purely cosmetic)

GML 8306 – 6-Channel Reference Class-A Microphone Preamplifier

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