B and K PRO-10 Owners manual

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
Back panel view	page 8
Back panel description	page 9
Balanced Preouts	page 9

Page 1

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
Making the connection	page 14
Troubleshooting	page 15
Specifications	page 16
Warranty	page 17

Accessories Included : Power cord, Power supply, Owners Manual

Page 2

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 control to minimum first. It is recommended that you turn the amplifier ‘off’ as well for this operation.

•The PRO10 is equipped with raised feet so that continuous ventilation can be maintained. They help to maintain acoustic feedback into the amplifier at a minimum. They also provide a measure of protection against scratching any surface the unit might be resting on. Do not alter or remove them.

•Do not stack anything on top of the preamplifier (processor, source...etc.).

Page 3

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 premium connectors have also been utilized to minimize degradation in the signal path. The PRO10 has an external power supply that should be connected to an unswitched AC source. In order to obtain maximum performance from this unit, Please read these instructions very carefully.

Features

FET loading - Maximizes linearity and minimize noise.

Wide bandwidth - Assure clear reproduction with all styles of music.

Polypropylene

film capacitors - RIAA accuracy typically within ± .2 dB through the use of polypropylene film capacitors. This produces a transparent sound with highly accurate musical timbre.

Volume control - From a single precision attenuator. Accuracy of volume attenuation is within .1 dB from channel to channel.

1% Metal Film resistors - Low noise resistors for better sound and a greater degree of repeatability.

Also: Direct output capability

All discrete predriver circuitry

Premium gold-plated connectors

Separate source and record selectors

Balanced outputs standard

Page 4

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 5

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 one of the six input pairs is routed to the processing circuitry and then to the preamplifier output connectors (PRE AMP OUT). The signal made available at these connectors is used to drive the external power amplifiers.

TAPE

MONITOR - The tape monitor switch allows the tape deck connected to the tape monitor inputs (TMON IN) to be routed to the processing circuitry and then to the preamplifier’s output connectors (PRE AMP OUT) independent of the position of SELECT. The input signal selected via SELECT remains valid but is overridden while the TAPE MONITOR switch is in the ON position (switch pushed in). Turning the TAPE MONITOR off (switch pushed out) restores the input signal determined by the SELECT position.

DIRECT

BYPASS - The DIRECT BYPASS switch selects the active or passive mode. In the active mode (switch out) the selected signal is processed through a 20 dB DC coupled amplifier. The passive mode (switch in) bypasses the gain stage of the preamplifier.

POWER

SWITCH - The power switch is actually a mute switch. This switch changes the mode of the preamplifier. With the switch on, LED illuminated, the signal is passed from the source to the amplifier. With the switch off, LED off, the source is passed to the headphone jack.

HEAD-
PHONE -	Stereo headphones having a standard ¼ inch binaural plug can be connected
	to the headphone output. The mute switch must be in the off position for the
	headphone output to be enabled.
LED -	Indicates which mode the preamplifier is in. When the LED is illuminated the
	preamplifier passes the selected source to the outputs of the preamplifier to
	the amplifiers. When the LED is off the preamplifier passes the selected
	source to the headphone jack.

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