Heritage Audio 1073 80 Series Microphone Preamp

Product Description

The Heritage Audio 1073 has been engineered to fill the input module slots of vintage 80 Series sound mixing consoles. In case outboard fitting is preferred, the 1073 can be installed into the Heritage Audio Frame 8 and Rack 2 powered enclosures.

Special care has been taken in sourcing the correct components ensuring the closest performance to original units as possible. Custom polystyrene and polypropylene film tone capacitors have been developed to closely match the Siemens Styroflex and Mullard Mustard types of the late 60s/early 70s. Custom input transformers have also been co-designed with Carnhill Transformers' Oxford factory to Heritage's special requirements, ensuring correct harmonic distortion content and saturation points.

The Heritage Audio 1073 is entirely handmade in Heritage's facilities in Spain, employing the same original wiring and soldering techniques of the 70s. Heritage's mater builders take several day to manufacture a single module. All circuitry is held in four plug-in cards.

Specifications:

• Microphone input impedance: HI, 1200 Ohm minimum, LO, 300 Ohm minimum, higher gain positions gradually have greater impedances, optimum for low gain ribbon mics, input is transformer balanced and floating
• Line input impedance: 10 kOhms bridging, transformer balanced and floating
• Output impedance: Less than 75 Ohms, transformer balanced and floating, to drive a load of 600 Ohms
• Maximum output: Greater than +26 dBu into 600 Ohms
• THD: Less than 0.025% at 1 kHz, less than 0.05% at 100 Hz
• Frequency response: 20 Hz (+0.3 dB) to 20 kHz (-0.2 dB)
• Maximum Gain: Slightly greater than 80 dB
• Noise: Less than -100 dBu
• Power consumption: Less than 110 mA @24 VDC