583e 500-series Tube Mic Preamp with EQ


The Model 583E 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.

LaChapell Audio 583e Mic Pre/EQ Features:

True Vacuum Tube Amplifier.

Jensen Microphone Input Transformer.

Nickel/Alloy Output Transformer.

Accessible Tube Section.

Integrated OR Independent 3-band EQ.



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.