} Heritage Audio Grandchild 670 Vari-Mu Stereo Tube Compressor 500 Serie — Pro Audio Reserve
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Heritage Audio Grandchild 670 Vari-Mu Stereo Tube Compressor 500 Series

$2,299.00
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Description

 

Heritage Audio Grandchild 670 Features

 


Heritage Audio Grandchild 670 Vari-Mu 500 Series tube compressor front panel

That Compressor Sound — Now in Your 500 Series Rack

There's a reason engineers have been chasing the sound of classic Vari-Mu tube compression for decades. That effortless glue, the way it breathes with the music, the warmth it adds without ever sounding like it's doing anything at all — that's exactly what the Grandchild 670 puts in your hands, in a double-wide 500 Series module.

Two new-old-stock mil-spec 6BA6 tubes per channel and three custom-wound transformers give the Grandchild 670 the weight, depth, and character of the hardware that inspired it — built to Heritage Audio's exacting standards in their Spanish factory and priced for the real world.

As an authorized dealer, Pro Audio Reserve ensures your Grandchild 670 is a genuine Heritage Audio product backed by full manufacturer warranty and support.

 Heritage Audio Grandchild 670 stereo tube limiter compressor module

Program-Dependent Compression That Moves With Your Music

Vari-Mu compression doesn't work like a VCA or FET — it listens. Gain reduction starts gently on small peaks and scales naturally up to brickwall limiting on the loudest transients, all without you touching a knob. Five selectable attack and release time constants let you tailor how aggressively the circuit responds, from barely-there bus glue to full, deliberate limiting.

Where most units bury the DC Threshold in an internal trimpot, the Grandchild 670 puts it right on the front panel. Dial in your slope continuously — from a silky smooth compression-to-limiting transition all the way to a harder, more pronounced knee — and hear the difference in real time.

 Heritage Audio Grandchild 670 500 Series module installed in rack

Track, Mix, Master — It Does All Three

The Grandchild 670 isn't a one-trick compressor you pull out for specific sessions — it's the kind of unit that stays patched in because everything sounds better through it. Vocals sit more naturally. Drum buses breathe. Full mixes take on that cohesive, finished quality that used to require much more expensive hardware to achieve.

A front-panel VU meter, On/Bypass/Off switch for instant A/B, and a clean double-slot 500 Series format mean it integrates into your workflow without friction. Heritage Audio built this for engineers who take their sound seriously — and want the tools to match.

Highlights

  • Vari-Mu tube stereo compressor/limiter in a convenient double-wide 500 Series module
  • Two NOS mil-spec 6BA6 tubes per channel with three custom-wound transformers
  • Program-dependent gain reduction scaling from gentle compression to brickwall limiting
  • Five selectable attack/release time constants and front-panel DC Threshold for variable slope control
  • VU meter, On/Bypass/Off switch, and robust build quality for reliable daily use

Technical Specifications

Specification Details
Processor Type Tube Vari-Mu Compressor/Limiter
Channels Stereo
Tubes 2 x NOS mil-spec 6BA6 per channel
Transformers 3 x custom-wound
Controls Input Gain, AC Threshold, DC Threshold, Time Constant Switch
Time Constants 5 selectable positions
Frequency Response 20Hz – 20kHz (±0.5dB)
Metering VU Meter
Bypass On/Bypass/Off Switch
Module Slot Size Double (2-slot)
Power Usage ±16V / 200mA per rail, per slot
Depth 7.08"
Weight 2.46 lbs
Manufacturer Part Number Grandchild

What's in the Box

Included Items
Heritage Audio Grandchild 670 500 Series Stereo Tube Compressor Module
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 Grandchild 670 Features

 


Heritage Audio Grandchild 670 Vari-Mu 500 Series tube compressor front panel

That Compressor Sound — Now in Your 500 Series Rack

There's a reason engineers have been chasing the sound of classic Vari-Mu tube compression for decades. That effortless glue, the way it breathes with the music, the warmth it adds without ever sounding like it's doing anything at all — that's exactly what the Grandchild 670 puts in your hands, in a double-wide 500 Series module.

Two new-old-stock mil-spec 6BA6 tubes per channel and three custom-wound transformers give the Grandchild 670 the weight, depth, and character of the hardware that inspired it — built to Heritage Audio's exacting standards in their Spanish factory and priced for the real world.

As an authorized dealer, Pro Audio Reserve ensures your Grandchild 670 is a genuine Heritage Audio product backed by full manufacturer warranty and support.

 Heritage Audio Grandchild 670 stereo tube limiter compressor module

Program-Dependent Compression That Moves With Your Music

Vari-Mu compression doesn't work like a VCA or FET — it listens. Gain reduction starts gently on small peaks and scales naturally up to brickwall limiting on the loudest transients, all without you touching a knob. Five selectable attack and release time constants let you tailor how aggressively the circuit responds, from barely-there bus glue to full, deliberate limiting.

Where most units bury the DC Threshold in an internal trimpot, the Grandchild 670 puts it right on the front panel. Dial in your slope continuously — from a silky smooth compression-to-limiting transition all the way to a harder, more pronounced knee — and hear the difference in real time.

 Heritage Audio Grandchild 670 500 Series module installed in rack

Track, Mix, Master — It Does All Three

The Grandchild 670 isn't a one-trick compressor you pull out for specific sessions — it's the kind of unit that stays patched in because everything sounds better through it. Vocals sit more naturally. Drum buses breathe. Full mixes take on that cohesive, finished quality that used to require much more expensive hardware to achieve.

A front-panel VU meter, On/Bypass/Off switch for instant A/B, and a clean double-slot 500 Series format mean it integrates into your workflow without friction. Heritage Audio built this for engineers who take their sound seriously — and want the tools to match.

Highlights

  • Vari-Mu tube stereo compressor/limiter in a convenient double-wide 500 Series module
  • Two NOS mil-spec 6BA6 tubes per channel with three custom-wound transformers
  • Program-dependent gain reduction scaling from gentle compression to brickwall limiting
  • Five selectable attack/release time constants and front-panel DC Threshold for variable slope control
  • VU meter, On/Bypass/Off switch, and robust build quality for reliable daily use

Technical Specifications

Specification Details
Processor Type Tube Vari-Mu Compressor/Limiter
Channels Stereo
Tubes 2 x NOS mil-spec 6BA6 per channel
Transformers 3 x custom-wound
Controls Input Gain, AC Threshold, DC Threshold, Time Constant Switch
Time Constants 5 selectable positions
Frequency Response 20Hz – 20kHz (±0.5dB)
Metering VU Meter
Bypass On/Bypass/Off Switch
Module Slot Size Double (2-slot)
Power Usage ±16V / 200mA per rail, per slot
Depth 7.08"
Weight 2.46 lbs
Manufacturer Part Number Grandchild

What's in the Box

Included Items
Heritage Audio Grandchild 670 500 Series Stereo Tube Compressor Module
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