INTRODUCTION:
Thank you for choosing the Bryston BHA-1 Head
Phone Amplifier. We welcome any suggestions
you may have, or comments regarding the opera-
tion of your amplifier. We consider you, our cus-
tomer, to be Bryston’s’ most important resource,
and your opinion is very much appreciated. No
warranty card is necessary to initiate your cover-
age. Refer to the back page for detailed warranty
information. Please save the original box and all
packing materials. Always use the original pack-
ing materials when shipping or moving the BHA-1.
GENERAL DESCRIPTION:
The BHA-1 is a stereo headphone amplifier that
features:
● Balanced dual mono circuitry
● High quality laser trimmed Noble stereo
Volume control
● Left/Right balance control
● 6 fully discrete class A Bryston opera-
tional amplifiers
● Balanced outputs: 4 pin stereo and dual
left/right 3 pin outputs
● Stereo ¼ inch single ended outputs
● 14dB or 20dB of selectable gain available
● All input and output connectors are Gold
plated
● 10k input impedance
● Multiple headphone drive capability
● Power supply options:
Standard: high quality Bryston inter-
nal analog power supply
Optional: External MPS-2 power
supply (replaces internal
supply)
INSTALLATION & SETUP:
Check the label next to the power input con-
nector on the rear of the BHA-1 and verify
your amplifier complies to your local A/C volt-
age and frequency requirements.
The BHA-1 is a convection cooled amplifier. The
entire enclosure, and the aluminum top in particu-
lar, acts as a large surround heat sink helping to
transfer heat to the surrounding air. Therefore the
BHA-1 installation should allow for unrestricted
air flow around it. We recommend maintain-
ing at least 3 inches of clear space to the sides
and top of the amplifier. The BHA-1 should not
be installed near other heat sources like heat-
ing vents or radiators. The BHA-1 should not be
installed in tight enclosed areas.
Bryston recommends that at least 6 inches of
space be provided to the rear of the amplifier for
properly dressing input, output and power cables.
POWER CONDITIONERS:
Bryston urges caution in choosing a power
conditioner for your audio/video system. Large
power amplifiers can draw very substantial
current from the wall plug, and many so-called
power conditioners can in fact hinder the supply
of current by inserting resistances in series with
the line cord. However, there are now power
conditioners that can reduce or eliminate RF
and ‘hash’ from the AC supply and may actu-
ally improve current delivery to your system.
This type of power conditioner (exemplified by
Bryston B.I.T. Power Conditioners) uses the
energy storage in a large toroidal transformer to
provide high instantaneous power and reduce
the substantial AC output resistance of the wall
socket and house wiring. This resistance can
be in the range of 0.5 to 1 Ohm and is typically
reduced to only a few milli-ohms by the Power
Conditioner. That in turn considerably reduces
Voltage drop in the power line on high current
surges and quite substantially increases the
stability of the power line improving audio (and
video) focus, precision and clarity.
XLR CONNECTOR OPTIONS:
Although the pictures and illustrations in this
manual show all female non-locking connec-
tors, all XLR connectors are available with lock-
ing mechanisms on a special order basis. Also,
the XLR output connectors on the front panel
are available in either gender (male or female).
FUSE:
The BHA-1 has a single, fast acting 5x20mm
tubular glass fuse, located in a locking drawer
that is integrated into the power inlet (see pg’s
6 & 7). Turn off the unit and remove the power
cord before attempting to remove and replace
the fuse. Replace fuse with the type and value
stated on the fuse label. In the event of a
descrepency, follow the data on the fuse label.
For 100-120V
AC models: F 2A/250V
For 200-240V
AC models: F 1A/250V
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