Heritage Audio GRANDCHILD 670
500 Series Tube Vari-Mu Compressor
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.
In common with its big brother, there is an INPUT GAIN
control with an adjustable range of 20dB, the AC Threshold, 5 Attack
and Release selectable times, the DC Threshold which gives access to the
progressive ratio, which is a unique curve adjustment combining control
of the ratio and knee, soft stepped from hard limiting to a very smooth
and transparent, light compression. There is also a 3 position
high-pass Sidechain filter to reduce the lower frequency´s influence on
the detection circuit, a must have nowadays for current productions.
As
this is a stereo unit, a sum of the two channels will determine the
overall dBs of gain reduction for both channels ensuring a stable stereo
image. All built into a
solid 2 space unit for the popular 500 series format with an attractive
age-referencing front panel complete with a beautiful, informative VU
meter that not only indicates Gain Reduction metering but also informs
the user of the unit’s 3-position Active/Bypass /Off switch confirming
the status even from a distance.
It’s
not easy to achieve that classic warm, hugging, intimate sound that
just seems to effortlessly glue together a MIX in a musical way, but the
GRANDCHILD 670/500 does it perfectly. Having
already designed the 19¨ rack Stereo/M&S/two channel version and
the 19¨ rack Mono version, it was just a question of fitting that ever
so familiar sound, into a smaller space. The
engineers at Heritage Audio accepted the challenge and responded with
determination to achieve that lush, classy, elegant tone. With
four 6BA6 (5749) tubes and three transformers you can be sure that your
signal will be treated like royalty and whatever you put through the
GRANDCHILD 670/500 will come out sounding much better.
- Input Impedance: 15 kO.
- Output Impedance: 50 O.
- 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).