Heritage Audio 1073/500 Preamp/EQ Module for the 500 Series

500 Format This exact 1:1 1073 replica was made with zero compromises... all three vintage accurate transformers, dual concentric switches , pushbuttons and same exact PCB cards. Exactly what the name says. No downsized knobs. No transformers left out. No ICs in place of discrete class A circuitry. Just what the faceplate says: a 1073 in a 500 series format.

Features: 70dB Class A Microphone preamplifier, HI-LO selectable minimum input impedance, balanced and floating. High gain positions show a higher impedance, ideal for old ribbon mics. 10dB Class A Line Amplifier, Bridging input impedance, balanced and floating. Class A, single ended, 2N3055 driven high headroom output stage. High Frequency: +/-16dB shelving at 12 kHz, Baxandall type. Low Frequency: +/-16dB with selectable frequency shelving of 35Hz, 60Hz, 110Hz & 220Hz, Baxandall type Mid Frequency: +/-18dB peaking, fixed 'Q' , selectable center frequencies of 0.36kHz, 0.7kHz, 1.6kHz, 3.2kHz, 4.8kHz , and 7.2kHz , dual inductor based. High Pass Filter: 18dB per octave slope, switchable between 50Hz, 80Hz , 160 Hz & 300Hz, inductor based. EQ Button: Switches the equalizer on or off. Phase Button: Flips phase 180?.

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