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The Manley Mastering Room Phono Preamp was produced between 1992 - 1996
The Manley Mastering Room Line Preamp was produced between 1995 - 1997
The Manley Control Master Phono Preamp was produced between 1997 - 2001
The Manley Control Master Line Preamp was produced between 1997 - 2000
Manley Mastering Room a.k.a. Control Master Preamplifiers
Features & SpecificationsPhotosDownloads

We offer the Control Master Preamplifier in two versions: Line only or Line with Phono (MM and MC). The design is completely Dual-Mono with separate power supplies for each channel including two custom-designed power transformers. The audio boards are also separate. All the wiring from the rear input connectors to the front selector switch and precision custom stepped attenuator is painstakingly hand wired using professional studio twisted pair shielded six-9's copper cable for optimum shielding and low noise characteristics, and although it would be much cheaper, easier, and faster to simply put these leads on several feet of printed circuit board traces like most everybody else does, we opt for purity of sound however many more hours it takes. The high-current line amplifier circuit employed here is one we have developed and refined over the years in our MANLEY Professional series. We hope you agree with us, and hundreds of satisfied users and studios around the world, that this circuit really delivers. For more information about variable feedback, read "Notes on Negative Feedback".

a top view
A newer chassis build
An older chassis build

See a HUGE picture of the rear panel here.

Get the owner's manual for the Manley Mastering Room (a.k.a. Control Master) Preamplifiers.



Features and Specifications

    Manley Mastering Room (a.k.a. Control Master):

    Line Preamplifier Phono Version
  • Vacuum tubes:
  • Vacuum tubes:
  • 2 x 12AU7A (Line amplifiers)
  • 2 x 12AX7A (Line amplifiers)
  • 4 x 12AU7A (Phono Stage)
  • 2 x 12AT7A
    (White Follower Output Drivers)
  • 2 x 12AT7A
    (Cathode Follower Output Drivers)
  • Gold plated faceplate
  • Cathode follower buffered RECORD OUT
  • Unbalanced and Balanced outputs
  • Gain (MM stage): 40 dB at REC OUT
  • (Unbuffered) Record Output
  • Gain (MC stage): 50 dB at REC OUT
  • MUTE switch
  • Transformer-coupled MC stage
  • Input Impedance: 100 kOhm
  • Input Impedance MM stage: 47 kOhms
  • Output Impedance: 50 Ohms
  • Input MM capacitive loading usually
    set at 100pf
  • Power Consumption: 33 Watts
  • Input Impedance MC stage: 38 Ohm
  • Precision stepped Volume control
  • Pin Out of 5 Pin MC transformer input XLR is as follows:
  • All-Triode design
  • Pin 1: Right Channel (+) positive (brown)
  • Gain with FB @MIN: OdB
  • Pin 2: Right Channel (-) negative (red)
  • Gain with FB @MAX: 6dB
  • Pin 3: GROUND
  • Variable Feedback
  • Pin 4: Left Channel (+) negative (red)
  • Mains Voltage Frequency:
  • Pin 5: Left Channel (-) positive (brown)
  • Dimensions: W=19", L=13", H=2.5"
  • This transformer has a 1:13 step up ratio
  • Shipping weight: 16 Ibs
  • Factory set for 100V, 120V or 220-240VAC
    operation for original destination country's mains voltage.
  • Fuse Value for 100 or 120V operation: 1/2 Amp MDA or MDL type SLO-BLOW Time Delay size: 1/4" x 1 1/4"
  • Fuse Value for 220-240V operation: 1/4 Amp MDA or MDL type SLO-BLOW Time Delay size: 1/4" x 1 1/4"
  • Operating Mains Voltage changeable with
    power transformer changeover switch and
    fuse value change

Manufacturer's Suggested Retail Price
  • Manley Mastering Room Phono Preamplifier Original Retail Price: $4,800 clams (USD$) each
  • Manley Mastering Room Line Preamplifier Original Retail Price: $3,600 clams (USD$) each
  • Manley Control Master Phono Preamplifier Original Retail Price: $7,000 clams (USD$) each
  • Manley Control Master Line Preamplifier Original Retail Price: $5,000 clams (USD$) each

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