LaChapell Audio Model 583e - 500 series Tube Preamp with 3 Band EQ section

The Model 583e from LaChapell Audio is a transformer isolated tube preamp with a 3 band equalizer that can be used jointly or independently. The amplifier stage is the same as the 583S (which is the first 500 series tube pre) 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.

583e Features

Ultra-clear and phase-coherent transformerless 3-band EQ 

12AX7 tube preamplifier with Jensen JT-115k transformer-based input stage

EQ input resistance: 40 Kohms

EQ output resistance: 50 Kohms

EQ bands: Low: 30Hz-400Hz; Mid: 325Hz-5kHz; High: 2.5kHz-20kHz

EQ cut/boost: +/-8dB

EQ max input: +24dBu

EQ max output: +26dBu

EQ self-noise: -93dB

EQ THD+N: 0.012% (with +8dBu input signal)

Preamp gain range 0dB-70dB

Preamp THD+N (gain @50dB, 0dBu output): < 0.25

Preamp frequency response (-3dB, output favored): 12Hz-70kHz

Preamp input impedance (mic) 1.5 Kohms, (hi-Z) 40 Kohms

Preamp tube: 1 x 12AX7

Total weight: 3.5 lbs.

$1690 at Sweetwater Sound