JOHN HARDY Jensen Twin Servo 990 w/ 3channels — Microphone
JOHN HARDY Jensen Twin Servo 990 w/ 3channels — Microphone
John Hardy Jensen Twin Servo 990 is a transformer-coupled microphone preamp mainframe available with 1 to 4 channels; this entry represents a 3-channel configuration.
Specifications
Format
| Product type | Transformer-coupled rackmount microphone preamplifier |
|---|---|
| Configuration | 3-channel configuration in a mainframe that supports 1 to 4 channels |
| Rack format | 1U 19-inch rackmount |
| Gain range | 16 to 60 dB |
Circuit and Controls
| Input transformer | Jensen JT-16-B |
|---|---|
| Op amps | Two 990C discrete op-amp modules per channel |
| Output transformer | Jensen JT-11-BMQ |
| Standard controls | Gain, 20 ohm mic or 20 dB pad switch, polarity reverse, phantom power, ground lift and LED metering |
Performance
| Ein | -128.7 dBu, 20 Hz-20 kHz unweighted, 60 dB gain, 150 ohm source |
|---|---|
| Frequency response | 20 Hz and 20 kHz: -0.05 dB typical, -0.1 dB max; -3 dB at 0.4 Hz and 140 kHz |
| Thd | 0.001% typical, 0.003% max at +4 dBu output, 100 Hz-20 kHz |
| Input impedance | 1.27 kOhms |
| Phantom power | +52 VDC, 9.5 mA maximum |
| Max output level | +24 dBu into 75 ohm load |
Fit and constraints
Intended use
Constraints
To use it
Questions
Which connections, drivers, operating systems, and sample rates are supported by this exact revision?
Ask before you buy via contact. Confirm power, condition grade, and included items against the listing photos.
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
The John Hardy Jensen Twin Servo 990 is a transformer-coupled microphone preamplifier available in a 1U 19-inch rackmount format with configurable channel count from 1 to 4. This unit features the Jensen JT-16-B input transformer and dual 990C op-amp modules per channel, delivering a gain range of 16 to 60 dB with standard controls including phantom power, polarity reverse, and ground lift. The 3-channel configuration shown here includes LED metering and operates with specifications including -128.7 dBu equivalent input noise and 0.001% typical THD. Additional channels can be added to the mainframe after purchase.
Seller notes: JOHN HARDY Jensen Twin Servo 990 w/ 3channels — Microphone. jensen TWIN SERVO 990.