} Heritage Audio Herchild 670 Stereo Tube Variable-Mu Compressor Limiter — Pro Audio Reserve
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Heritage Audio Herchild 670 Stereo Tube Variable-Mu Compressor Limiter

$5,996.00
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Description


Heritage Audio Herchild 670 Stereo Tube Compressor Overview

  Heritage Audio Herchild 670 stereo tube variable-mu compressor

Program-Dependent Variable-Mu Compression With 22 Tubes

The Heritage Audio Herchild 670 is a formidable recreation of the iconic Fairchild 670 — the most coveted compressor in recording history. Built with Class A circuitry featuring 22 tubes and nine transformers, including AMI input transformers and CineMag output transformers, the Herchild 670 delivers the inimitably smooth, creamy, and natural-sounding dynamics control heard on countless classic recordings of the 1960s, 70s, and beyond.

The variable-mu design produces a gentle soft-knee compression curve with reasonably fast attack and fairly long release times. Compression is program dependent, with gain reduction starting at a very low ratio on small peaks and gradually increasing to brickwall territory on very loud input signals. While the original Fairchild required accessing an internal trim pot for DC Threshold adjustment, the Herchild 670 brings this powerful control out to the front panel for immediate access across a wide range — from a seamless transition between compression and hard limiting to a harder, more pronounced knee.

 Heritage Audio Herchild 670 LAT VERT mid-side processing

LAT/VERT Mode for Mid-Side Processing

Like its vintage inspiration, the Herchild 670 features LAT VERT and LAT VERT LINK modes that were originally developed for vinyl disc mastering. These modes give you full mid-side (M-S) processing capability, allowing you to compress the mid and side signals independently for mixes with increased width, depth, and focus. LAT VERT LINK does the same with both channels linked for traditional stereo operation.

This mid-side capability makes the Herchild 670 an invaluable mastering tool, allowing precise control over stereo width and image stability. A sidechain filter accommodates modern studio applications by minimizing the influence of low frequencies on compression action — essential for clean, artifact-free compression on full mixes and program material with heavy low-end content.

 Heritage Audio Herchild 670 handwired transformer coupled Class A

Legendary Performance at Half the Weight and Price

Less than 1,000 original Fairchild 670s were ever built, and a functioning vintage unit in good condition commands a staggering price — and weighs 66 pounds. The Herchild 670 delivers the sought-after sonics and program-dependent behavioral characteristics of the original at half the weight (29.32 lbs) and a fraction of the cost, designed to stringent tolerances and meticulously crafted in Heritage Audio's factory in Spain.

Founded in 2011 by engineer/producer Peter Rodriguez, Heritage Audio leverages handwired, transformer-coupled Class A circuitry with functionality aimed at today's studio workflows. The Herchild 670 delivers clean, problem-free audio with generous headroom and the vintage-flavored sonics that engineers have coveted for over six decades — now available to studios of every pedigree. As an authorized dealer, Pro Audio Reserve ensures you receive a genuine Heritage Audio product backed by full manufacturer warranty and long-term support.

Highlights

  • Faithful recreation of the iconic Fairchild 670 stereo tube compressor
  • Class A variable-mu tube circuitry with 22 tubes and 9 transformers
  • AMI input transformers and CineMag output transformers
  • Program-dependent soft-knee compression with gradual ratio increase
  • Front-panel DC Threshold control for variable slope adjustment
  • LAT/VERT mode for full mid-side (M-S) processing
  • LAT/VERT LINK mode for linked stereo mid-side operation
  • Sidechain filter to minimize low-frequency influence on compression
  • Frequency response: 40 Hz – 15 kHz (±2 dB)
  • Half the weight of a functioning vintage Fairchild 670
  • Handwired construction designed and built in Spain
  • 6U rackmount format
  • Ideal for tracking, mixing, and mastering applications

Heritage Audio Herchild 670 Specifications

Specification Details
Compressor Type Tube variable-mu compressor/limiter
Number of Channels 2 (stereo)
Circuit Design Class A, handwired
Tubes 22 tubes
Transformers 9 transformers (AMI input, CineMag output)
Frequency Response 40 Hz – 15 kHz (±2 dB)
Controls AC/DC Threshold, Metering, Input Gain, Time Constant, Sidechain Filter
Stereo Modes LAT/VERT (mid-side), LAT/VERT LINK (linked mid-side)
Sidechain Sidechain filter for low-frequency control
Analog Inputs 2 x XLR
Analog Outputs 2 x XLR
Rack Spaces 6U
Dimensions (H x W x D) 10.5" x 19" x 7.87"
Weight 29.32 lbs
Power Source Standard IEC AC cable
Manufactured Spain

What's in the Box

Included Items
Heritage Audio Herchild 670 Stereo Tube Compressor/Limiter
Power Cable
User Documentation
Shipping

Shipping & Returns

  • We deliver all US orders in 3–5 business days
  • Free cancellations
  • Returns accepted within 30 days (unused items)

Order Confirmation

Once your order is placed, you will receive an order confirmation email. This confirms that we have received your order and have pre-authorized your credit card for the purchase. After confirming availability with our suppliers, we will proceed accordingly:

  • If your item is available and ready to ship within 1–2 business days, we will process the charge and arrange for shipment.

  • If your item is on backorder or unavailable, the pre-authorization will be voided and you will be notified by email.

  • Please note: While most items ship out within 1–2 business days, total delivery time is typically 3–5 business days, depending on your location and carrier handling.

Order Shipment

If your item is in stock and your payment has been processed, your order will typically ship within 1–2 business days. Total delivery time is approximately 3–5 business days from the date of order. Once shipped, you will receive tracking information at the email address provided during checkout within 24 hours of dispatch.

If you have not received tracking information within 3–5 business days of placing your order, please contact us at support@proaudioreserve.com.

The Distributor-Direct Advantage

To ensure you receive the most recent hardware revisions and 100% factory-sealed units, Pro Audio Reserve utilizes a Distributor-Direct fulfillment model. Unlike big-box retailers that may ship "floor models" or gear that has been sitting in general-purpose warehouses, your equipment is pulled directly from the primary manufacturer hub, serialized, and dispatched. This process ensures the highest level of quality control for professional-grade recording equipment.

Shipping Policy

We currently offer free shipping within the United States only. If the checkout process on our website allows you to enter a shipping address and complete your order, your location is eligible to receive delivery.

Changing Shipping Address

If you need to change your shipping address after your order has been processed or shipped, we will do our best to accommodate the request. Please note that address changes may result in delivery delays. Any additional costs incurred due to address changes, including carrier fees or rerouting charges will be the responsibility of the customer. No exceptions.

Shipping Times

All shipping times provided are estimates and should not be considered guarantees. Most orders ship out within 1–2 business days from the time payment is processed. However, total delivery time is typically 3–5 business days, depending on your location, carrier performance, and supplier fulfillment timelines.

We work closely with our vendors to ensure timely deliveries, but please note that supply chain disruptions, high-demand periods, or weather events may occasionally cause delays beyond our control.

  • To avoid misunderstandings: The “shipping time” refers to the total time from order placement to final delivery, not just when the item leaves the warehouse.

  • Cancellations: If you choose to cancel your order because it has not arrived within the estimated delivery window, you may be responsible for applicable shipping charges, restocking fees, warehouse handling costs, and other related fees.

  • Chargebacks: Customers who initiate chargebacks due to shipping delays without contacting us first may be held legally responsible for losses. We strongly encourage open communication so we can resolve any delivery concerns directly and efficiently via our Atlanta-based support team.

Delivery Options

  • Threshold Shipping: Your item will be delivered to your front door, porch, garage, or a covered entryway.

 

Why Buy From Us

We get it. You've got a lot of choice when it comes to online retailers.
Here's why we think you should shop with us at ProAudioReserve.

  • Free Shipping USA wide. 
  • 30 Day Easy Returns. Not happy with your product, we'll take it back noquestions asked.
  • Great Service. We pride ourselves on the best service, anywhere.

Reviews
Description


Heritage Audio Herchild 670 Stereo Tube Compressor Overview

  Heritage Audio Herchild 670 stereo tube variable-mu compressor

Program-Dependent Variable-Mu Compression With 22 Tubes

The Heritage Audio Herchild 670 is a formidable recreation of the iconic Fairchild 670 — the most coveted compressor in recording history. Built with Class A circuitry featuring 22 tubes and nine transformers, including AMI input transformers and CineMag output transformers, the Herchild 670 delivers the inimitably smooth, creamy, and natural-sounding dynamics control heard on countless classic recordings of the 1960s, 70s, and beyond.

The variable-mu design produces a gentle soft-knee compression curve with reasonably fast attack and fairly long release times. Compression is program dependent, with gain reduction starting at a very low ratio on small peaks and gradually increasing to brickwall territory on very loud input signals. While the original Fairchild required accessing an internal trim pot for DC Threshold adjustment, the Herchild 670 brings this powerful control out to the front panel for immediate access across a wide range — from a seamless transition between compression and hard limiting to a harder, more pronounced knee.

 Heritage Audio Herchild 670 LAT VERT mid-side processing

LAT/VERT Mode for Mid-Side Processing

Like its vintage inspiration, the Herchild 670 features LAT VERT and LAT VERT LINK modes that were originally developed for vinyl disc mastering. These modes give you full mid-side (M-S) processing capability, allowing you to compress the mid and side signals independently for mixes with increased width, depth, and focus. LAT VERT LINK does the same with both channels linked for traditional stereo operation.

This mid-side capability makes the Herchild 670 an invaluable mastering tool, allowing precise control over stereo width and image stability. A sidechain filter accommodates modern studio applications by minimizing the influence of low frequencies on compression action — essential for clean, artifact-free compression on full mixes and program material with heavy low-end content.

 Heritage Audio Herchild 670 handwired transformer coupled Class A

Legendary Performance at Half the Weight and Price

Less than 1,000 original Fairchild 670s were ever built, and a functioning vintage unit in good condition commands a staggering price — and weighs 66 pounds. The Herchild 670 delivers the sought-after sonics and program-dependent behavioral characteristics of the original at half the weight (29.32 lbs) and a fraction of the cost, designed to stringent tolerances and meticulously crafted in Heritage Audio's factory in Spain.

Founded in 2011 by engineer/producer Peter Rodriguez, Heritage Audio leverages handwired, transformer-coupled Class A circuitry with functionality aimed at today's studio workflows. The Herchild 670 delivers clean, problem-free audio with generous headroom and the vintage-flavored sonics that engineers have coveted for over six decades — now available to studios of every pedigree. As an authorized dealer, Pro Audio Reserve ensures you receive a genuine Heritage Audio product backed by full manufacturer warranty and long-term support.

Highlights

  • Faithful recreation of the iconic Fairchild 670 stereo tube compressor
  • Class A variable-mu tube circuitry with 22 tubes and 9 transformers
  • AMI input transformers and CineMag output transformers
  • Program-dependent soft-knee compression with gradual ratio increase
  • Front-panel DC Threshold control for variable slope adjustment
  • LAT/VERT mode for full mid-side (M-S) processing
  • LAT/VERT LINK mode for linked stereo mid-side operation
  • Sidechain filter to minimize low-frequency influence on compression
  • Frequency response: 40 Hz – 15 kHz (±2 dB)
  • Half the weight of a functioning vintage Fairchild 670
  • Handwired construction designed and built in Spain
  • 6U rackmount format
  • Ideal for tracking, mixing, and mastering applications

Heritage Audio Herchild 670 Specifications

Specification Details
Compressor Type Tube variable-mu compressor/limiter
Number of Channels 2 (stereo)
Circuit Design Class A, handwired
Tubes 22 tubes
Transformers 9 transformers (AMI input, CineMag output)
Frequency Response 40 Hz – 15 kHz (±2 dB)
Controls AC/DC Threshold, Metering, Input Gain, Time Constant, Sidechain Filter
Stereo Modes LAT/VERT (mid-side), LAT/VERT LINK (linked mid-side)
Sidechain Sidechain filter for low-frequency control
Analog Inputs 2 x XLR
Analog Outputs 2 x XLR
Rack Spaces 6U
Dimensions (H x W x D) 10.5" x 19" x 7.87"
Weight 29.32 lbs
Power Source Standard IEC AC cable
Manufactured Spain

What's in the Box

Included Items
Heritage Audio Herchild 670 Stereo Tube Compressor/Limiter
Power Cable
User Documentation
Shipping

Shipping & Returns

  • We deliver all US orders in 3–5 business days
  • Free cancellations
  • Returns accepted within 30 days (unused items)

Order Confirmation

Once your order is placed, you will receive an order confirmation email. This confirms that we have received your order and have pre-authorized your credit card for the purchase. After confirming availability with our suppliers, we will proceed accordingly:

  • If your item is available and ready to ship within 1–2 business days, we will process the charge and arrange for shipment.

  • If your item is on backorder or unavailable, the pre-authorization will be voided and you will be notified by email.

  • Please note: While most items ship out within 1–2 business days, total delivery time is typically 3–5 business days, depending on your location and carrier handling.

Order Shipment

If your item is in stock and your payment has been processed, your order will typically ship within 1–2 business days. Total delivery time is approximately 3–5 business days from the date of order. Once shipped, you will receive tracking information at the email address provided during checkout within 24 hours of dispatch.

If you have not received tracking information within 3–5 business days of placing your order, please contact us at support@proaudioreserve.com.

The Distributor-Direct Advantage

To ensure you receive the most recent hardware revisions and 100% factory-sealed units, Pro Audio Reserve utilizes a Distributor-Direct fulfillment model. Unlike big-box retailers that may ship "floor models" or gear that has been sitting in general-purpose warehouses, your equipment is pulled directly from the primary manufacturer hub, serialized, and dispatched. This process ensures the highest level of quality control for professional-grade recording equipment.

Shipping Policy

We currently offer free shipping within the United States only. If the checkout process on our website allows you to enter a shipping address and complete your order, your location is eligible to receive delivery.

Changing Shipping Address

If you need to change your shipping address after your order has been processed or shipped, we will do our best to accommodate the request. Please note that address changes may result in delivery delays. Any additional costs incurred due to address changes, including carrier fees or rerouting charges will be the responsibility of the customer. No exceptions.

Shipping Times

All shipping times provided are estimates and should not be considered guarantees. Most orders ship out within 1–2 business days from the time payment is processed. However, total delivery time is typically 3–5 business days, depending on your location, carrier performance, and supplier fulfillment timelines.

We work closely with our vendors to ensure timely deliveries, but please note that supply chain disruptions, high-demand periods, or weather events may occasionally cause delays beyond our control.

  • To avoid misunderstandings: The “shipping time” refers to the total time from order placement to final delivery, not just when the item leaves the warehouse.

  • Cancellations: If you choose to cancel your order because it has not arrived within the estimated delivery window, you may be responsible for applicable shipping charges, restocking fees, warehouse handling costs, and other related fees.

  • Chargebacks: Customers who initiate chargebacks due to shipping delays without contacting us first may be held legally responsible for losses. We strongly encourage open communication so we can resolve any delivery concerns directly and efficiently via our Atlanta-based support team.

Delivery Options

  • Threshold Shipping: Your item will be delivered to your front door, porch, garage, or a covered entryway.

 

Why Buy From Us

We get it. You've got a lot of choice when it comes to online retailers.
Here's why we think you should shop with us at ProAudioReserve.

  • Free Shipping USA wide. 
  • 30 Day Easy Returns. Not happy with your product, we'll take it back noquestions asked.
  • Great Service. We pride ourselves on the best service, anywhere.

Reviews