Owner’s Manual
Please read the Owner’s Manual completely BEFORE operating the unit.
Thank you for your investment in
the Herron Audio Vacuum Tube
Phono Preamplifier, a masterpiece
of high-precision analog audio play-
back equipment. It is designed to be
the finest product of its type avail-
able. The care in engineering and
manufacturing of this product
anticipates a lifetime of musical
enjoyment.
The Herron Phono Preamplifier
was created to address the retrieval
of musical information from vinyl
LPs without any compromise. The
original design was only intended
for use by a few dedicated music
lovers in their cutting edge audio
systems. The design was so good,
and demand so high, that the unit
was refined and engineered to meet
the requirements for a more durable
unit manufactured in larger quanti-
ties. In the process, important
refinements were developed and dis-
coveries were made about tolerances
and the threshold of human hearing
limits.
This product is engineered to be
user friendly, and overcomes the
fears that many have expressed
concerning the use of vacuum tubes
in their systems. Its limited produc-
tion ensures that the components in
each unit are matched to the highest
standards in the industry. Manufac-
turing of the unit is performed under
the tightest of quality controls.
Components are hand-matched to
exacting standards—to ensure iden-
tical unit-to-unit performance. For
example, capacitors in the RIAA
equalization stage are hand matched
to tolerances of better than 0.1%.
Tubes are burned in, bench tested,
and hand-matched both across units
and to the original design. These
techniques ensure
that each unit performs to the high
standards established in the develop-
ment of the original prototypes. This
costly process is reflected in the
unprecedented performance and
lack of unit-to-unit variations of
Herron Audio components.
The special power supply in all
Herron Audio products reflects the
engineering innovation that allows
the Herron Phono Preamplifier to
provide the highest musical satisfac-
tion without the artifacts produced
by most other tube-based compo-
nents. This power supply provides a
one
Welcome!
Welcome!
Herron Audio Vacuum Tube Phono Preamplifier
Table of Contents
1 Introduction
3 Models
3 Design Considerations
4 Front Panel Information
5 Rear Panel Information
6 Installation and Operation
7 Cartridge Loading
8 Power Line Polarity
8 Optimum Performance
9 Changing Tubes
10 Technical Specifications
© 2002 Herron Audio
Division of Herron Engineering, Inc.
12685 Dorsett Road
# 138
St. Louis, MO 63043
314.434.5416
314.434.6629 fax
Owner’s ManualHerron Audio Vacuum Tube Phono Preamplifier
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