Grove Hill Audio introduces the LIVERPOOL — a hand-assembled, all-tube feedback compressor.
Tube compressors were first introduced in the early 1930’s, and became widely used in the United States and Europe in the 60’s. An original American Mu tube compressor found its way to England where it was improved with several modifications; these units are still in use today. However, these rare custom configurations have never been commercially available. For years there’s been much curiosity surrounding the modifications made to these renowned compressors. To differentiate the modified units,
The LIVERPOOL compressor is a distinct and unrivaled product, and NOT a clone of its predecessors. It is a fusion of the American compressor and the British-modified feedback compressor designs, with modern enhancements that were thoughtfully developed in the spirit of the original Mu tube compressor.
The designers of the LIVERPOOL compressor took well over a year to recreate the sonic character of the original units still in use at world famous recording studios. Custom-wound input and output transformers (Made in the USA), critical component choices and circuit layout make the LIVERPOOL compressor a reliable, creative tool for a wide variety of instruments, vocals and program sources. The LIVERPOOL power supply also provides low noise and exceptional stability even at high (30dB) gain reductions.
We are passionate about this remarkable compressor and are excited to offer it at an accessible price to the creative recording arts community. Because of the rare components used in the LIVERPOOL design, we are building the compressor in limited quantities.
Full Kit with Mono Ribbon Compressed
Floor Tom – Flat then with Compression
Kick – Flat then with EQ and Compression
Type: Tube compressor, 2U rack mount design
Frequency Response: +/- 1.5dB, 10 Hz to 40,000Hz
Power Output: +20 dBu
Total Harmonic Distortion: 0.08% at 1 KHz with output at 0dB
Noise Level: 82 dBu below rated output
Source Impedance: Any up to 15,000 Ohms
Load Impedance: 600 Ohms
Attenuation: 30 dB in 5 dB steps – Constant impedance.
Maximum Compression: 30dB
Attack Times (msec): 3*, 19*, 48*, 77*, 109*, 138*.
Recovery Times (*msec): 127*, 447*, 917*, 1.9 sec., 3.4 sec., 6 sec.
Threshold: 0dBm to +16dBm Output
Compression Ratios: 2:1 at 0dBm Threshold, 4:1 at +16dBm Threshold
Tube Complement: 6BC8/6BZ8, 6CG7, 6AL5
Circuit Design: Variable transconductance compression circuit utilizing a medium Mu, semi-remote cutoff twin triode tube.