We offered 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:

SPECIFICATIONS

LINE PREAMPLIFIER

2 x 12AU7A (Line amplifiers)
2 x 12AT7A
(White Follower Output Drivers)
Gold plated faceplate
Unbalanced and Balanced outputs
(Unbuffered) Record Output
MUTE switch
Input Impedance: 100 kOhm
Output Impedance: 50 Ohms
Power Consumption: 33 Watts
Precision stepped Volume control
All-Triode design
Gain with FB @MIN: OdB
Gain with FB @MAX: 6dB
Variable Feedback
Mains Voltage Frequency:
Dimensions: W=19", L=13", H=2.5"
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