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The Model 583E is a 500 series tube microphone preamp. It features the same amplifier stage found on the 583S including the Jensen JT-115k input transformer coupled with an ultra-clean transformer-less three-band EQ section with fully sweeping frequency controls and cut/boost settings of +/- 8dB. The EQ can run as an integrated EQ serving the preamplifier or separate as its own autonomous module where both units run independently.


- Internal Gain: 0 to >70dB
- THD+N: 0.25% (Variable)
- Frequency Response: 12Hz to 70KHz
- Max Output (1% THD+N): +26dBu
- RMS Noise: -95dBu
- Typical EIN: -120dBu
- Input Impedance: 1.5KΩ
- Tube Compliment: 1 x 12AX7/ECC83

- Noise Floor: -95dB
- THD+N: 0.012% (@ +4 output)
- Frequency Response: 10Hz to 50KHz (flat)
- Cut / Boost Range: +/- 12dBu
- Maximum Input Level: ≥25dB
- Input Impedance: 48KΩ
- Input / Output Type: Transformerless
- Stated specifications are typical measurements but subject to change without notice. All measurements taken while driving a 40kohm load with a 1khz source.
- The 583 (S or E) should only be used with power supply frames that have a >120ma rating per bay.
Brand reference number:583E
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