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  Pendulum Audio Quartet II ME Tube Recording Channel

Pendulum Audio Quartet II
Pendulum Audio Quartet II
 
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List Price: $5,250.00
Our Price: $4,600.00


Availability: Usually Ships in 24 Hours
Product Code: 9999-07807

 

Pendulum Audio Quartet II ME Tube Recording Channel

Pendulum Audio Quartet II ME Tube Recording Channel

Pendulum Audio Quartet II Tube Recording Channel Details

The Pendulum Audio Quartet II Tube Recording Channel is not an update nor a replacement for Pendulum Audio??s  very popular Quartet, but it is a complementary unit that incorporates a substantially different combination of elements. Many additional options have been provided to tailor the texture of the audio character for maximum musical flexibility.

The tube Mic/DI preamp has the unique option of being able to switch between two markedly different sounding input transformers and loading options. The DI can handle pickups, keyboards, or line-level signals. The mic preamp also 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 delta-mu compressor, derived from the popular ES-8, has the classic compression profile of the Fairchild 660 and 670 limiters. It can be used in one of five modes: Fast, Faster, Vintage (with program-dependent response), Average (rms responding), or full manual operation. It also features a switchable sidechain high pass filter to decrease the sensitivity of the compressor to low frequency content.

The new 3 band tube Passive/Aggressive Equalizer is a modern take on the classic inductor-based passive EQ. It features simultaneous Lo Shelf boost and cut, Mid Dip and Hi Peak bands. The Aggressive mode increases the saturation of the EQ circuit to add harmonic content. In addition, the EQ can be placed before or after the compressor with the flip of a switch.

The new JFET/MOSFET Peak Limiter uses a novel approach to brickwall analog limiting, with JFET and MOSFET modes for two different characters of peak limiting, and accurate led metering in 1 dB increments. Unlike other designs, the peak limiter adds no appreciable distortion below threshold.

Pendulum Audio Quartet II Tube Recording Channel Features

  • An enhanced version of the Mic/DI Tube Preamp from the MDP-1 with switchable mic input transformers and input loading.
  • The delta-mu Tube Compressor/Limiter from the ES-8 with additional sidechain modes.
  • A new inductor-based Passive Tube EQ with HI Peak, MID Dip and LO Boost/Cut bands and a harmonic-rich 'Aggressive' Mode.
  • A new brickwall analog peak limiter with JFET or MOSFET modes.
  • The Mic/DI, EQ, Compressor and Peak Limiter 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, 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.
Pendulum Audio Quartet II Tube Recording Channel Specifications
  • Circuit Type: Class A vacuum tube design with transformerless or transformer-balanced output
  • Mic/DI Preamp
    • Mic Preamp
    • Input Gain:+33 to +63dB (Full) or +40 to +70dB (Focused) in 3dB steps
    • Input Impedance:1500 or 10K (switchable), transformer balanced and floating
    • Frequency Response:
    • Full: -1.0dB 12Hz and 65kHz with 10K load, +45dB gain, unbalanced or transformer-balanced
    • -1.0dB 24Hz and 60kHz with 600 load, +45dB gain, unbalanced or transformer-balanced
    • Focused: -1.0dB 30Hz and 40kHz with 600 or 10K load,
    • +45dB gain, unbalanced or transformer-balanced output
    • Noise:EIN less than -124dBu with 150 input load (> 85dB below +4dBu), 0-30Khz bandwidth
    • Distortion:Full: THD+N less than 0.03%, +45dB gain, unbalanced output;
    • less than 0.06% from 200Hz-20kHz (< 0.2% at 20Hz), transformer-balanced output
    • Focused: THD+N less than 0.07%, +52dB gain, 200Hz-20kHz, 1.5% at 20Hz.
    • less than 0.08% from 200Hz-20kHz (<1.7% at 20Hz), transformer-balanced output
  • DI Preamp
    • Input Gain:+20 to +50dB (Instrument), 0 to +20dB (Line) in 3dB steps
    • Input Impedance:10M or 1M (Instrument), 100k with 20dB pad (Line)
    • Frequency Response:-1.0dB 12Hz and 110kHz, with 10K load, + 20dB gain, unbalanced or transformer-balanced
    • -1.0dB 20Hz and 95kHz, with 600 load, + 20dB gain, unbalanced or transformer-balanced
    • Noise:EIN less than -116dBu with input shorted (> 87dB below +4dBu)
    • Distortion:THD+N less than 0.015%, 20Hz-20kHz, +20dB gain, unbalanced output;
    • less than 0.05% from 200Hz-20kHz (< 0.5% at 20Hz), transformer-balanced output
    • Max. Output Level:+34dBu into 10k load, Output control at maximum, unbalanced or transformer-balanced
    • +25dBu into 600 load, Output control at maximum, unbalanced or transformer-balanced
    • Phantom Power:+48Vdc applied to pins 2 and 3
    • Mic Pad:-20dB pad at the primary of the mic input transformer (-40dB with DI input switched to 'Line').
    • Mic Phase:inverts the phase at the secondary of the mic input transformer
    • Mic Lo Cut:12dB/octave rolloff at 75 or 150Hz
    • Polarity:input and output XLR connectors are pin 2 hot
  • Equalizer
    • Circuit Type:Inductor-based passive EQ network with all-tube gain makeup stage ,with 'aggressive' mode
    • Input Sensitivity:+4dBu
    • Input Impedance:10kohms
    • Frequency Bands
    • Hi Peak: +10 to +20dB peaking at 0.8, 1.4, 2, 3, 4, 5, 8, 10, 12, 15 or 18 kHz, BW = 0.7 to 3.0
    • Mid Dip:-10 to -25dB notching at 200, 350, 500, 650, or 800 Hz, BW = 0.7 to 3.7
    • Lo Boost/Cut: ±20dB shelving Boost or Cut at 20, 30, 50, 100, or 120 Hz
    • Freq. Response:-1.0dB 5Hz and 200kHz with 10K output load, unbalanced or transformer-balanced
    • -1.0dB 20Hz and 370kHz with 600 output load, unbalanced or transformer-balanced
    • Noise:> 87dB below +4dBu
    • Distortion:THD+N less than 0.015% from 20Hz-20kHz, +20dB gain, unbalanced output;
    • less than 0.06% from 100Hz-20kHz (< 0.2% at 20Hz), transformer-balanced output
    • Passive/Aggressive: THD+N less than 1% @ 20Hz at +4 dBu, EQ controls set flat.
    • Max. Output Level:+34dBu into 10k load, +24dBu into 600 load, unbalanced or transformer-balanced
  • Delta-Mu Compressor
    • Circuit Type:Remote-cutoff gain control tube with class A solid-state gain makeup stage
    • Input Sensitivity:+4dBu
    • Input Impedance:10k (nominal) with 1:1 input transformer
    • Freq. Response: -1.0dB 16Hz and 56kHz with 600 output load
    • Noise:>89dB below +4dBu output level
    • with Output control at unity gain (12:00)
    • Distortion:less than 0.1% THD+N, 20Hz to 20kHz, below threshold
    • Output: +22 dBu into 10k load
    • Max. Gain Reduction:greater than 15dB
    • Threshold: up to 15dB of gain reduction at -5dBu input level
    • Ratio:1:1 to limiting, program-dependent
    • Output: off to +15dB
    • Modes: fast, faster, vintage, average or manual operation
    • Fast: 1.0 ms attack, 50ms release
    • Faster: 0.1 ms attack, 50ms release
    • Average: rms responding
    • Vintage multi-stage attack and release times, program dependent
    • Manual: attack time varaible from 1.0ms to 100ms
    • release time varaible from 0.1s to 2s
  • Peak Limiter
    • Circuit Type: Class A solid-state line amp with JFET or MOSFET limiting
    • Input Sensitivity:+4dBu
    • Input Impedance:10kohms
    • Freq. Response: -1.0dB 10Hz and 50kHz with 600 output load
    • Noise: >90dB below +4dBu 
    • Distortion: less than 0.01% THD+N, 20Hz to 20kHz, with limiter below threshold
    • Output: +22dBu into 10k load
    • Display:9 segment led ladder in 1 dB intervals from 0 to -8dB
  • General
    • Vacuum Tubes: (2) ECC83/12AX7A, (2) 6922/6DJ8, (1) 6ES8/ECC189
    • Power: 120V or 240Vac, 45W
    • Power Supplies: +300Vdc, + 250Vdc, +6.3Vdc, +12.6Vdc , ± 18Vdc, +15Vdc, +10Vdc, fully regulated with soft-start warm-up and output muting
    • Dimensions:2U enclosure, 19" x 3.5" x 12.5" (48.2 x 8.8 x 31.8 cm)
    • Weight: 15.8 lb. (7.2kg)

Note: Operating level is +4dBu = 0VU = 1.228v

Unless otherwise stated, all measurements are referenced to +4dBu, 0-80 kHz bandwidth.

All specifications are subject to change without notice.

As with all tube circuits, specifications will vary with tube brand, age or differences in internal structure.