Page 1 table of contents safety precautions page 3 introduction page 4 front panel view page 5 front panel description page 6 record page 6 select page 6 tape monitor page 6 direct bypass page 6 power switch (mute) page 6 headphone page 6 led page 6 balance page 7 volume page 7 stereo/mono page 7 ba...
Page 2 unbalanced preouts page 9 tape monitor loop page 9 line level inputs page 9 phono inputs page 9 phono ground page 10 power connection page 10 phono stage configuration page 10 mm/mc selection page 10 capacitive loading page 10 resistive loading page 11 tables page 12 block diagram page 13 mak...
Page 3 safety precautions please read before installing • turn preamplifier ‘off’ when plugging in or unplugging input and speaker cables!!! • when plugging in or unplugging interconnect cables running from source to preamplifier, always mute the preamplifier and rotate the preamplifiers volume cont...
Page 4 introduction thank you for selecting b&k components, ltd.’s pro10 preamplifier. The pro10 is designed for the discriminating audiophile. The pro10 is a dc coupled preamplifier that has been designed using all discrete circuit topology with a switchable head amp on the phono stage. Gold-plated...
Page 5 front panel view 1. Record selector knob 2. Source selector knob 3. Tape monitor button 4. Direct bypass button 5. Power switch (mute switch) 6. Headphone jack 7. Power on led 8. Balance knob 9. Volume knob 10. Mono/stereo selector button.
Page 6 front panel description record - controls which one of the six input pairs is routed directly to the record output connectors (rec out). The selected input signal bypasses the remainder of the preamplifier’s circuitry to provide the purest possible recording source. Select - controls which on...
Page 7 balance - the balance control is used to adjust the relative volume of the left and right channels. This affects the pre amp out connections and the headphone output. Volume - turning the volume control clockwise increases the volume level, counterclockwise decreases the volume level. Stereo ...
Page 8 back panel view 1. Balanced pre-outputs 2. Unbalanced pre-outputs (rca) 3. Tape monitor loop 4. Line level inputs 5. Phono inputs 6. Phono ground connection 7. Power connection for external power supply.
Page 9 back panel description balanced preouts - for use with balanced output cables when your amplifier has balanced inputs. The balanced outputs will help improve the quality of sound being reproduced by the amplifier when there is a long run between the amplifier and the preamplifier. Balanced co...
Page 10 phono ground - for connection of your ground wire for phono use. Power connection - for connection of the included power supply. ** caution must be taken when connecting the included power supply. Do not force the plug as you may damage the pins inside the preamplifier. The plug is keyed so ...
Page 11 selector switch. 3. Trim the leads of the capacitors (one required per channel) to approximately _ inch. 4. Insert the leads into the cload pin receptacles securely. Resistive loading note: the pro10 is shipped from the factory with a 100 kohm resistor installed and the phono stage mm config...
Page 12 note: you may not be able to attain the proper value resistor to fit you application, use the closest standard value you can find. Refer to the following table for more calculated values of mm rc desired (ohms) ri calculated (ohms) ri standard (ohms) 5 k 20 k 35 k 50 k 75 k 5.3 k 25.0 k 53.8...
Page 13 figure 1 block diagram.
Page 14.
Page 15 making the connection the diagram below shows a typical connection between the preamplifier and a b&k amplifier using the unbalanced rca outputs. Note: the balanced button on the amplifier must be in the off (out) position. The diagram below shows a typical connection between the preamplifie...
Page 16.
Page 17 pro10 specifications moving coil sensitivity (at 1khz) .09 mv moving coil overload (at 1khz) 17 mv moving coil load resistance variable moving coil load capacitance variable moving coil (s/n a weighted) 70 db moving magnet sensitivity (at 1khz) .8 mv moving magnet overload (at 1khz) 225 mv m...
Page 18 limited warranty b&k components ltd., referred to herein as b&k, warrants your b&k equipment against all defects in material and workmanship for a period of five years from the date of purchase. This warranty applies only to the original purchaser and only to equipment in normal residential ...
