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Pendulum Audio Quartet Tube Recording Channel  From Pendulum

Tube Recording Channel

Pendulum Audio

Manufacturer's Description from Pendulum

The All-In-One Tracking Tool for High Resolution Recording

The Quartet is a modern class A tube design which includes:

  • The tube Mic/DI Preamp from the MDP-1
  • The tube Opto-Compressor from the OCL-2 using our proprietary optoelectronic cell
  • A new three band tube EQ with HI and LO shelving and peaking MID band
  • A new de-esser design using opto-inductive filtering and a highly selective detector
  • The Mic/DI, EQ and Compressor/De-Esser can be patched out and used independently.
  • Transformerless or transformer-balanced main output
  • Gold-plated switch contacts, I/O connectors and tube sockets
  • Polypropylene caps and metal film resistors (pairs matched to 0.1%)
  • Fully regulated high voltage (300V) and filament and bipolar power supplies with soft-start warm-up and output muting
  • Custom toroidal power transformer with shield for minimum hum
  • 120V or 240V ac voltage switch on the rear panel.

   The Quartet is an all-purpose recording tool designed with the ultimate in sound quality and flexibility in mind. We have combined four elements - Mic/DI preamp, Opto-compressor, EQ, and De-esser -into a fully integrated package that it makes it easy to track any source. In addition, the Mic/DI preamp, EQ and Compressor/De-esser are completely independent entities that can be patched out and used separately - a hand feature that makes it a valuable tool for mixing as well as tracking.

   The Mic/DI preamp, borrowed from our acclaimed MDP-1, can handle mics, pickups, keyboards, or line-level signals. It features phantom power, input pad, phase reversal, and a switchable lo-cut filter. Independent gain and output controls permit overdrive of the tube stage to vary the harmonic content of the preamp.

   The Opto-Compressor, derived from the popular OCL-2, uses our proprietary optoelectronic cell, and has a sound all its own. It can be used in one of four modes: Fast (for 'invisible' compression), Average (rms responding), a new Vintage mode (with program-dependent response), or full manual operation.

   Our new 3 band tube EQ, a modifed Baxandall design, is simple but very effective. The HI and LO bands have up to ±10dB of shelving at 15, 10 and 7 kHz, and 50, 100 and 200 Hz respectively. The MID band has a broad ±10dB peaking response centered at 0.7, 1.6, 2.2, 3.3, 5.0 and 6.5 kHz. The EQ can be placed before or after the compressor with the flip of a switch.

   The new De-esser, which is implemented within the opto-compressor, uses an entirely new approach. A highly selective inductor-based detector triggers a very fast opto-inductive notch filter. The user can control the depth of the notch, which in turn controls amount of sibilance to be removed. When not triggered, the de-esser is out of the signal path entirely.

Pendulum Audio

About Manufacturer

Pendulum Audio specializes in high-quality, hand-built vacuum tube recording equipment and electronics designed for amplifying stringed instruments. Since 1988, our Preamp Systems for Acoustic Instruments have been the choice of musicians worldwide who are serious about their sound - both on stage and in the studio. In 1998, we debuted a line of class A tube mic preamps and dynamics processors, which have quickly become modern classics.