Heritage Audio 1073 User manual

1073 Channel amplier

1073 FEATURES

• 80dB Class A Microphone preamplier, HI-LO selectable minimum input impedance, balanced and oating. High gain positions show a higher impedance, ideal for old ribbon mics.

• 10dB Class A Line Amplier, Bridging input impedance, balanced and oating.

• 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, xed ‘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 180º.

• 1073 Module available. 19” Convertible format available Spring 2012

1073 SPECIFICATIONS

• 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 oating.

• Line input impedance: 10KOhms bridging, transformer balanced and oating.

• Output impedance: Less than 75 Ohms, transformer balanced and oating, to drive a load of 600 Ohms.

• Maximum output: Greater than +26dBm into 600 Ohms, greater than +32dBu into 10KOhms.

• 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 -100dBm.

• Power consumption: 106 mA @24VDC.

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