Product Details
HA6673

6673 Mic Pre 4 Band EQ, 1073 Class A PreAmp with 1066 mid EQ

80 Series Microphone Preamplifier/EQ Module, with Class A Amplifier, 80dB of Gain, 4-band EQ, and Highpass Filter

Product Details
It is also compatible with the Heritage Audio Frame 8 and Rack 2 powered enclosures. The 6673 is a 4 band equalizer in a 1073 sized module, combining the mid band of the vintage 1066 module and an expanded 1073 mid band. This fact allows a more complex equalizing whilst at the same time maintaining the same sonic qualities. Vintage connoisseurs already know how sweet the 1066 mid band sounds and how well it complements the 1073′s one. Additionally the 6673 features three frequency′s options for the high shelf, as opposed to the fixed ones on both the 1073 and 1066, covering both. Special care has been taken in sourcing the correct components that ensure performance will be as close to a 1070s unit as it is possible nowadays. Custom polystyrene and film tone capacitors have been developed to closely match the Siemens Styroflex and Mullard Mustard types of the late 60s and early 70s. Custom input transformers have also been co designed with Carnhill Transformers′ Oxford factory to our special requirements. The Heritage Audio 6673 is entirely handmade in our facilities in Spain, employing the same old-fashioned wiring and soldering techniques of the 70s. All its circuitry is held into five plug in cards.
Technical Specification
Microphone input impedance HI, 1200 Ohm minimum, LO, 300 Ohm minimum. Higher gain positions gradually have greater impedances, optimum for lo gain ribbon mics. Input is transformer balanced and floating. Line input impedance: 10KOhms 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 +26dBu into 600 Ohms, THD: Less than 0.025% at 1Khz, Less than 0.05% at 100Hz. Frequency response :20Hz (+0.3dB) to 20Khz (-0.2dB). Maximum Gain: Slightly greater than 80dB. Noise: Less than -100dBu. Power consumption: Less than 110 mA @24VDC.
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