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Heritage Audio 6673 80 Series Microphone Preamp w/4 Band EQ

The Heritage Audio 6673 500 Series Microphone Preamp: 80dB 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.


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Discounted Price $2,999.00
Special Order Item. Call 1-800-472-6274.

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Discounted Price $2,999.00
In March 1970 the first 1073 module was launched and became the standard in 80 series consoles. The 1066 was gradually replaced in newly shipped consoles and finally disappeared. The 1073 featured almost the same identical circuitry, being the most relevant differences the hi frequency shelving (12Khz instead of 10Khz ) and the equalizer´s mid band, which had one more center frequency, but lacked the constant Q of the 1066.

Vintage module connoisseurs do know how sweet the 1066 mid band sounds and, for some, something was lost in the way. Until now...

The 6673 module is the answer to an old question among vintage module users. Should I use a 1073 or a 1066 for this specific source material? Should I need to boost at 700 Hz or would it be better to cut at 360 Hz? Should I need 12Khz or would it probably better to add 10Khz instead?
These and a lot more questions that have become "classic" in some professional environments have a new answer.

Heritage Audio is proud to introduce the 6673 module. A 100% series 80 compatible module featuring the same Class A mic preamplifier found in the classic modules with an added key feature: A 4 BAND EQUALIZER. Better said, THE 4 band equalizer as it features the same exact 3 band equalizer circuit found in the famous 1073 plus the mid band found in the 1066.

In addition, Heritage Audio have expanded the 1073 mid band with 3 extra frequency choices, widening the sonic palette.

Now you can boost at 700 Hz for "thick as a brick" guitars and cut at 360 Hz to get rid of the mud.

• 10dB Class A Line Amplifier, Bridging input impedance, balanced and floating
• Class A, single ended, 2N3055 driven high headroom output stage
• High Frequency: +/-16dB selectable frequency shelving at 10, 12 or 16 kHz, Baxandall type
• Low Frequency: +/-16dB with selectable frequency shelving of 35Hz, 60Hz, 110Hz & 220Hz ,Baxandall type
• 1073 Mid Frequency: +/-18dB peaking, fixed 'Q' , selectable center frequencies of 0.24 Khz, 0.36kHz, 0.53Khz, 0.7kHz, 1.1Khz, 1.6kHz, 3.2kHz, 4.8kHz , 7.2kHz and 10Khz , dual inductor based
• 1066 Constant Q Mid Frequency: +/-18dB peaking, fixed ´Q´, selectable center frequencies of 0.7 Khz, 1.2 Khz, 2.4Khz, 3.6Khz, 7.0Khz, inductor based
• High Pass Filter: 18dB per octave slope, switchable between 50Hz, 80Hz & 300Hz, inductor based. (Although push button switches has been used instead of the classic rotary switch, the circuit is the same exact one found in vintage 1073s, sacrificing only one frequency choice for space issues. Real state is tight on these modules)
• EQ Button: Switches the equalizer on or off
• Phase Button: Flips phase 180º

Get your Heritage Audio 6673 80 Series Microphone Preamp today at the guaranteed lowest price from Sam Ash Direct with our 45-day return and 60-day price protection policy.

Great variation on a classic


Great box. The combination of the 1066 and 1073 eq with extra bands is fantastic. A really useful combination, and different than a 1081. I have two vintage Neve 1073 and also used to work at a studio with a Neve console loaded with 1081 for a few years. While there are still some differences in the sound of the preamp vs. an original unit, overall this is the closest new version that I've used. Much closer than a Vintech or a BAE to my ears. The main difference seemed to be with distorted electric guitars, where the vintage unit seemed to be a bit smoother and saturated a little more perhaps. This could just be due to older caps, who knows. Would be great if they added a Q switch a la 1084 or 1081, and maybe a few new lower bands to the 1066 section to take it to the next level, but at this price it's already a great improvement on a 1073 eq section. Really cool useful eq that is pretty unique yet familiar at the same time.




Heritage Audio 6673 80 Series Microphone Preamp W/4 Band Eq

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