The 73 sound with an extra 1066 mid band – a 4-band tone shaper in one 80 Series module. The Heritage Audio 6673 is a 73-sized 80 Series input module that adds the 1066 mid band to the classic 73 design. It is made to fill input slots when restoring vintage 80 Series consoles, and also fits the Heritage Audio Frame 8 and Rack-2 or any rack, console or enclosure that follows the same mechanical and electrical standard.
Why customers choose it
Who it is for
Studios with 80 Series consoles or racks, engineers restoring vintage desks, and anyone who wants a 73-style mic preamp with extra EQ power for vocals, drums, bass and mixing.
What’s in the box
- 1 x Heritage Audio 6673 module
Specifications
| Format | 80 Series module |
|---|---|
| Mic input impedance | HI 1200 ohm / LO 300 ohm minimum; transformer balanced and floating |
| Line input impedance | 10 kohm bridging, transformer balanced and floating |
| Output impedance | Less than 75 ohm, transformer balanced and floating (600 ohm load) |
| Maximum output | Greater than +26 dBu into 600 ohm |
| 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 |
| EQ | 4-band: 1066 mid, 73 mid, Baxandall high shelf (3 frequencies), low shelf |
| Power consumption | Less than 110 mA at 24 V DC |
| Type | 80 Series microphone preamp and EQ module |
| Circuit | Class A, hand-wired |
Good to know
- This is a module: it needs an 80 Series frame or console to run, such as the Heritage Audio Frame 8 or Rack-2.
- For the 81-style mid bands instead, see the Heritage Audio 8173.
- For a 500 Series line-input EQ that shares its 73 EQ, see the Heritage Audio 73EQ JR.
FAQ
Can I use it on its own on my desk?
No. It needs a powered 80 Series enclosure such as the Frame 8 or Rack-2.
Is it good for ribbon mics?
Yes. Higher gain positions have higher input impedance, which suits low-gain ribbon mics.
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