GML 8302
GML 8302
GML 8302 Series II is a two-channel transformerless microphone preamplifier from George Massenburg Labs. The manufacturer states that the 8302 uses all-discrete bipolar transistor circuitry with no FETs, ICs or electrolytic capacitors in the signal path, and direct-coupled outputs with active DC servos.
Specifications
Format
| Product type | Two-channel microphone preamplifier |
|---|---|
| Rack format | 1U rackmount |
| Power supply | Ships with external GML Model 8355 power supply and 5-pin XLR power cable |
Circuit
| Topology | All-discrete bipolar transistor, completely transformerless |
|---|---|
| Signal path | No FETs, ICs or electrolytic capacitors in the signal path |
| Outputs | Direct-coupled outputs with active servo DC correction |
Controls
| Gain | 10 dB to 65 dB in 5 dB steps |
|---|---|
| Phantom power | Switchable 48 V phantom power, 40 mA available |
| Phase reverse | Front-panel phase reverse switches |
| Clip indicator | +24 dBv +/-0.5 dB clip indicator |
Audio Specifications
| Input | 1 kOhm balanced XLR; 80 dB CMRR at 100 Hz and 10 kHz |
|---|---|
| Maximum input | +12.4 dBv before clipping at minimum gain |
| Maximum output | +27.4 dBv clipping, unbalanced XLR pin 2 hot |
| Distortion | Maximum SMPTE IMD 0.0015% at 30 dB gain / 0.007% at 70 dB gain at +20 dBv output |
| Frequency response | +0/-0.2 dB at 10 Hz and 50 kHz; +0/-0.3 dB at 1.7 Hz and 260 kHz |
Fit and constraints
Intended use
Constraints
To use it
Questions
Which connections, drivers, operating systems, and sample rates are supported by this exact revision?
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What cables, mounts, power supplies, or licenses are included?
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Is the current retailer listing new stock, demo stock, open box, or special order?
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Description
GML 8302 Series II is a two-channel transformerless microphone preamplifier from George Massenburg Labs. The manufacturer states that the 8302 uses all-discrete bipolar transistor circuitry with no FETs, ICs or electrolytic capacitors in the signal path, and direct-coupled outputs with active DC servos. Gain is front-panel selectable from 10 dB to 65 dB in 5 dB steps. Series II units add front-panel +48 V phantom power and phase reverse switches and use a redesigned lower-noise phantom supply. The spec sheet lists 1 kOhm balanced XLR input, 80 dB common-mode rejection at 100 Hz and 10 kHz, +12.4 dBv maximum input at minimum gain, +27.4 dBv output clipping, +24 dBv clip indication, 48 V phantom with 40 mA available, 1.75 x 19 x 10 in rack enclosure and external +/-28 V Model 8355 power supply with 5-pin XLR cable.