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    Heritage Audio GRANDCHILD 670 500 Series Vari-MU stereo compressor

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    After having shocked and impressed the audio industry with the HERCHILD Model 670 & Model 660, Heritage Audio has now turned to the 500 series format to offer something extremely rare…  An analog stereo Variable Mu tube compressor in a two-space 500 series module! 

    The GRANDCHILD 670/500 is stuffed with 4 6BA6 (5749) NOS tubes, three exclusively designed transformers (one per channel & and one for the Sidechain) and the necessary select components and circuitry to capture that elusive sound.  For the first time ever it is possible to achieve that sought after tone and response in such an affordable package.


    • Inspired by Fairchild: The GRANDCHILD is a true homage to the revered Fairchild compressor, now redesigned for the modern studio environment. It stands as the first stereo Vari-MU compressor in a 2-slot 500 series format, integrating the soul of the Fairchild with cutting-edge technology.
    • Tube-Driven Warmth: At its heart, the GRANDCHILD boasts 4 New Old Stock (NOS) military-grade 6BA6 tubes, ensuring that your tracks are imbued with warmth and character. These tubes, known for their reliability and rich sonic qualities, are integral to the unit’s unique sound.
    • Custom Transformers: Three custom-made transformers add further depth and dimension to the audio signal. These transformers contribute to the unit’s exceptional clarity and punch, ensuring a vibrant and dynamic sound.
    • Advanced Compression Control: Featuring 5 adjustable Attack and Release times, surpassing the flexibility of the original unit. This allows for nuanced dynamic control, catering to a wide range of audio material and styles.
    • Progressive DC Threshold: This feature blends ratio and knee control, enabling everything from hard limiting to smooth, transparent compression. This level of control is pivotal for tailoring the compression to the specific needs of each track.


    • Input Impedance: 15 kΩ. 
    • Output Impedance: 50 Ω. 
    • Output Level: +29 dBu. 
    • Frequency Response: 20 Hz to 20 kHz ± 0.5 dB. 
    • Self Noise: Less than -78 dBu. 
    • Harmonic Distortion: Less than 0.5 % at any level up to +24 dBu output (no compression).
    • Dimensions (W x H x L): 180 mm x 133 mm x 75 mm.
    • Weight: 1.120 Kg.
    • Consumption: Slightly over 200mA per rail per slot (+16V/-16V).