The LaChapell Audio Model 583s was the world’s first vacuum tube mic preamp designed for the 500 series format. It is still the only 500 series module to properly power the tube with 250V of TrueTube™ technology. Unlike some other vacuum tube mic preamps for the 500 series, we do not starve the tube of voltages in any way. And, since this all occurs within the 583 module, there is no worry of harming your 500 series power supply. With dual drive knobs to separately drive the input and output, the 583S provides total flexibility to explore a broad sonic pallet enhancing its versatility for all of your recordings.
Internal Gain 0 to >72dB THD+N 0.10% (minimum) Frequency Response 10Hz to 50KHz Max Output (1% THD+N) +26dBu Typical EIN -121dBu Input Impedance 1.5KΩ Tube Compliment 1 x 12AX7/ECC83
Stated specifications are typical measurements and subject to change without notice. All measurements taken while driving a 40kohm load with a 1khz source.