Y R A N I M I L PRE BHA-1 OWNER’S MANUAL
IMPORTANT SAFETY INSTRUCTIONS The lightning flash with arrowhead symbol within an equilateral triangle, is intended to alert the user to the presence of un-insulated “dangerous voltage “ within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product.
BHA-1 HEADPHONE AMPLIFIER TABLE of CONTENTS Safety Instructions, Warranty and Contact Information ............Opposite General Information.................................................................. Page 1 Introduction General Description Installation & Setup Power Conditioners XLR Connector Options Fuses Technical Specifications................................................................ Page 2 Driving Multiple Pairs of Headphones Front Panel Legends..............................................
INTRODUCTION: Thank you for choosing the Bryston BHA-1 Head Phone Amplifier. We welcome any suggestions you may have, or comments regarding the operation of your amplifier. We consider you, our customer, to be Bryston’s’ most important resource, and your opinion is very much appreciated. No warranty card is necessary to initiate your coverage. Refer to the back page for detailed warranty information. Please save the original box and all packing materials.
BHA-1 HEADPHONE AMPLIFIER BHA-1 SPECIFICATIONS Power Output: Maximum: Nominal: Input Impedance: 10K ohms single ended (unbalanced) +15K/-5K ohms double ended (balanced) Sensitivity: 20 14 20 14 dB dB dB dB setting: setting setting: setting 6 Watts per channel into 32 Oms 500 milliwatts per channel into 50 Ohms 0.707 Volts in = 1.0 Watts into 50 ohms 1.411 Volts in = 1.0 Watts into 50 ohms 0.500 Volts in = 500 mW into 50 ohms 0.
BHA-1 REAR & FRONT PANEL LEGENDS FRONT PANEL 1: INPUT SELECT SWITCH Select between Balanced (XLR 3 pin female), RCA (unbalanced or single-ended) and MINI (3.5mm TRS or 3 conductor mini Phone jack) 2: GAIN SELECT SWITCH Select between 14 decibels (gain = 5) or 20 decibels (gain = 10) 3: VOLUME CONTROL 4: BALANCE CONTROL With centre detent. 5: BALANCED OUTPUTS Using two 3 pin XLR jacks, one for the left channel output and another for the right chan- nel output.
BHA-1 HEADPHONE AMPLIFIER 7: SINGLE ENDED OUTPUT Quarter inch stereo phone jack, also referred to as a ¼ inch TRS (Tip-Ring-Sleeve) connector, or a 3 conductor ¼ inch phone jack. This single ended or unbalanced output uses only one of two output stages and therefore delivers only half the available power. TIP = Left channel RING = Right channel, SLEEVE = ground (or common) 8: STATUS LED Lights green when the BHA-1 is turned ON.
12: FUSE LABEL & WARNINGS. Follow all warnings and cautions. 13: REMOTE TRIGGER INPUT When the power switch (item #9) is turned off (down) the unit can still be powered on by applying 12 volts DC at 50mA, across the two TRIGGER INPUT pins. A two position mating screw terminal connector (Bryston part number CO-110A-11102) is included with each unit. (see next page for hookup details) 14: STEREO MINI-JACK INPUT A 3.
BHA-1 HEADPHONE AMPLIFIER CONNECTING THE BHA1...EXT HEADPHONE AMPLIFIER to the MPS-2 POWER SUPPLY The BHA-1 is available without an internal power supply. These models require a Bryston MPS-2 external power supply and an interconnecting cable as shown below. The required cable assembly is with the MPS-2. When the MPS-2 is properly connected to the BHA-1 and the MPS-2 is turned on but the BHA-1 is turned off, the BHA-1’s front panel status indicator LED will light red.
BHA-1 OVERALL SCHEMATIC -20B LOGO H1 B H2 H3 H5 H6 H7 H9 47p 100R MJD243 MJD243 3 2 10K0 1 OUT L RL5B 6CM G 6C11 6R19 6 6 5 4 3 3C11 100N 3R19 100R -VA BRN 2RD 2P3 1 2 3 RED WHT 2RE GRY BLU BLK RED G2 2CA PCB2 PCB BHA1 TX AC SEL R5 2CE 10N JFSN 2CG L N AC 2CL 2CP 2200u + 2CM 2200u 33V+ 10N 10N 12V+ 2BR2 2RH + 2CH + 10N 2CK E R B 100K 6RL G6 ON LED 6P2 JFS4 6 B M GLD G6 CB + CC CE + 150R 47p 5C1 47u 100N 5C6 5C7 2200u 1K5 + DR4
BHA-1 HEADPHONE AMPLIFIER BHA-1 EXTERNAL DIMENSIONS
BHA-1 MODEL CODES There are no user serviceable parts inside the BHA-1. Please refer any servicing to qualified personnel. 300028-2[BHA1]20120307 BRYSTON LTD.
