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.

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.
Operating Mains Voltage changeable with power transformer changeover switch and fuse value change

• 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