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Woodham Phono Pre-Amplifier

6188彩票是不是黑台子 designed to complement the 300b power amplifier and the new kt88 amplifier - this all new pre-amplifier includes many new ideas and features, yet builds on cr's great experience in tube design.

6188彩票是不是黑台子the pre-amplifier is constructed on printed circuit boards to ensure a reliable and consistent product with minimal variations from one unit to another.

the main pcb contains the phono input and equalisation, line level pre-amplifier and output stages.

6188彩票是不是黑台子the line level pre-amplifier stages are arranged on the double-sided pcb in a dual mono configuration to minimise cross-talk wherever possible.

single ended and balanced input and outputs are provided to ensure compatibility with a wide range of input sources and power amplifiers.

for the phono input, 3 triodes are used per channel for gain and equalisation. accurate r1aa equalisation is achieved using some negative feedback, and close tolerance polypropylene capacitors carefully selected for this sensitive part of the pre-amplifier.

this is a 2-box design with an external power supply unit, housed in a small matching metal box. the illuminated vu meters complete a combination of retro and professional style. a separate tube stage ensures there is no interference with audio signals.

3d试机号历史对照表

Active

Input Level Line 250mV
Phono 3mV
Output Level775mV
Response 20Hz-25KHz ±0.1dB
Distortion <0.05%
Noise <100µV
Inputs 3 x Line
1 x Balanced
1 x Phono
Power Consumption 125 Watts
Line Voltage 115/230 Volts
Tube LineupPhono 12AY7 x 2 12AU7 x 1
Amplifier 12AX7 x 2 12AU7 x 2
Output Buffer 12AU7 x 2
Meter Buffer 12AU7x1
DimensionsUnpacked 480x330x140mm
Packed 530x450x240mm
PSU Unpacked 120x205x75mm
PSU Packed 190x450x160mm
Weight Net 9.5Kg
Weight Gross 11.25Kg