Herron Audio VTPH-2 Manuel utilisateur
Owner’s Manual
VTPH-2
Vacuum Tube
Phono Preamplifier
VTPH-2 Vacuum Tube Phono Preamplifier Owners Manual
Table of Contents
General Safety, Installation, 1
and Operation Instructions
Important Safety Instructions 2
Warning 4
Important (UK only) Instructions 5
Introduction 6
Design Considerations 8
Front Panel Features 9
Rear Panel Features 10
Installation and Operation 11
Cartridge Loading 12
Changing Tubes 14
Technical Specifications 15
FCC Notice 16
Re-cycling 17
RoHS Compliance 17
©2013 Herron Audio
Division of Herron Engineering, Inc.
12685 Dorsett Road
# 138
Maryland Heights, MO 63043 (St. Louis area)
314.434.5416
www.herronaudio.com
VTPH-2 Vacuum Tube Phono Preamplifier Owners Manual
Please read the Owner’s Manual Completely BEFORE operating the unit
1
General Safety, Installation,
and Operation Instructions
It is important to read this document before attempting to use this product.
Pay close attention to safety instructions.
Appears on the component to indicate the presence of
uninsulated, dangerous voltages inside the enclosure – volt-
ages that may be sufficient to constitute a risk of shock.
Appears on the component to indicate important operation
and maintenance instructions included in the accompany-
ing documentation.
Appears on the component to indicate compliance of with
the EMC (Electromagnetic Compatibility) and LVD (Low-
voltage Directive) standards of the European Community.
WARNING Calls attention to a procedure, practice, condi-
tion, or the like that, if not correctly performed or adhered
to, could result in personal injuries or death.
CAUTION Calls attention to a procedure, practice, condi-
tion, or the like that, if not correctly performed or adhered
to, could result in damage or destruction to part or all of
the component.
Note Calls attention to information that is essential to
highlight.
WARNING
CAUTION
Note
VTPH-2 Vacuum Tube Phono Preamplifier Owners Manual
2
Important Safety Instructions
1. Read these instructions
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth. Great care and attention has gone
into the materials chosen to produce the product. A gentle wipe with
a dry, clean cloth is all that is required to remove any dust. Treat it as
you would a fine piece of furniture because that is how they have been
designed.
7. Do not block ventilation openings. Install in accordance with the
manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat regis-
ters, stoves, or another apparatus that produces heat.
9. Do not defeat the safety purpose of the polarized or ground-
ing-type plug. A polarized plug has two blades with one wider than
the other. A grounding-type plug has two blades and a third grounding
prong. The wide blade or third prong is provided for safety. If the pro-
vided plug does not fit into the outlet, consult an electrician for replace-
ment of the obsolete outlet.
10. Protect the power cord from being walked on or pinched,
particularly at plugs, convenience receptacles, or the point where it exits
from the apparatus.
11. Only use attachments and accessories specified by the
manufacturer.
VTPH-2 Vacuum Tube Phono Preamplifier Owners Manual
Please read the Owner’s Manual Completely BEFORE operating the unit
3
12. Use only with the cart, stand, tripod, bracket, or table
specified by the manufacturer or sold with the apparatus.
When a cart is used, use caution when moving the cart/
apparatus combination to avoid injury or tip over.
13. Unplug this apparatus during lightning storms or when unused
for long periods of time.
14. Refer all servicing to qualified service personnel. Servicing is re-
quired when the apparatus has been damaged in any way, such as when
the power cord or plug has been damaged; liquid has been spilled or ob-
jects have fallen into the apparatus; or the apparatus has been exposed
to rain or moisture, does not operate normally, or has been dropped.
15. No naked flame sources, such as candles, should be placed on the
apparatus.
16. The appliance coupler is used as the disconnect
device, the disconnect device shall remain readily oper-
able.
17. Terminals marked with this symbol may be considered HAZARDOUS
LIVE and the external wiring connected to these terminals requires in-
stallation by an INSTRUCTED PERSON or the use of ready-made
leads or cords.
18. This exclamation point within an equilateral
triangle is intended to alert the user to the presence of
important maintenance (servicing) instructions in the
literature accompanying the appliance.
Warning! To reduce the risk of fire or electric shock, do not
expose the apparatus to rain or moisture. Do not place objects
containing liquid, such as vases, on this apparatus.
VTPH-2 Vacuum Tube Phono Preamplifier Owners Manual
4
Warning
• TO PREVENT FIRE OR SHOCK HAZARD, DO NOT USE THIS PLUG WITH
AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET UNLESS THE
BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE
• TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS
APPLIANCE TO RAIN OR MOISTURE
• TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE PLUG TO WIDE
SLOT AND FULLY INSERT
This lightning flash with an arrow head 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 the persons.
Warning: To reduce the risk of
electric shock, do not remove
cover (or back), no user-service-
able parts inside. Refer servicing
to qualified service personnel.
This exclamation point within an equilateral triangle is
intended to alert the user to presence of important mainte-
nance (servicing) instructions in the literature accompany-
ing the appliance.
VTPH-2 Vacuum Tube Phono Preamplifier Owners Manual
Please read the Owner’s Manual Completely BEFORE operating the unit
5
IMPORTANT! (U.K. only)
This unit is supplied in the U.K. with mains lead fitted with a moulded 13
amp plug. If, for any reason, it is necessary to remove the plug, please remove
the fuse holder and dispose of the plug safely, out of reach of children.
It must not be plugged into a mains outlet.
The wires in the mains lead supplied with this appliance are coloured in ac-
cordance with the following code:
Green and yellow..............Earth
Blue................................Neutral
Brown.................................Live
WARNING - This appliance MUST be earthed
As the colours of the wires of the mains lead of this appliance may not cor-
respond with the coloured markings identifying the terminals in the plug,
proceed as follows:
The wire which is coloured green-and-yellow must be connected to the
terminal in the plug which is marked with the letter E or coloured green or
green-and-yellow, or by the earth symbol :
The wire which is coloured brown must be connected to the terminal
which is marked with the letter L or coloured red.
The wire which is coloured blue must be connected to the terminal
which is marked with the letter N or coloured black.
If connecting to a BS1363 plug, a 13 amp fuse must be used.
WARNING:
ANY MODIFICATIONS TO THIS PRODUCT NOT EXPRESSLY
APPROVED BY HERRON AUDIO WHO IS THE PARTY RESPON-
SIBLE FOR STANDARDS COMPLIANCE COULD VOID THE USER'S
AUTHORITY TO OPERATE THIS EQUIPMENT.
VTPH-2 Vacuum Tube Phono Preamplifier Owners Manual
6
to hear. Expect to discover new joy
from every record in your collection.
At Herron Audio, our goal has al-
ways been to reproduce, as faithfully
as possible, the musical experience
captured on each of your cherished
recordings. Nothing removed, and—
equally important— nothing added.
Meticulous design, painstaking
selection of component parts, and
the evolution of our experience help
us get closer to that target with each
new model.
This product is engineered to be user
friendly and overcomes the fears
that many have expressed concern-
ing the use of vacuum tubes in their
systems. Its limited production
ensures that the components in each
unit are matched to the highest stan-
dards in the industry. Manufacturing
of the unit is performed under the
tightest of quality controls. Compo-
nents are hand-matched to exacting
standards to ensure identical unit-
to-unit performance. For example,
capacitors in the RIAA equalization
stage are hand matched to tolerances
of better than 0.1%. The units are
burned in, bench tested, and hand-
matched to the original design.
Thank you for your investment in
the Herron Audio Vacuum Tube
Phono Preamplifier, a masterpiece of
high-precision analog audio playback
equipment. It is designed to be the
finest product of its type available.
The care in engineering and manu-
facturing of this product anticipates
a lifetime of musical enjoyment.
The Herron VTPH-2 Phono
Preamplifier was created to address
the retrieval of musical information
from vinyl LPs without compromise.
The original design (the VTPH-1)
was originally 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 with the additional
features and performance enhance-
ments which are incorporated in the
VTPH-2. In the process, important
discoveries were made about toler-
ances and the threshold of human
hearing limits.
The VTPH-2 is a significant step for-
ward in the art and science of phono
preamplification. Its dynamics and
startling transparency may be dif-
ficult to describe, but are not difficult
Welcome!
VTPH-2 Vacuum Tube Phono Preamplifier Owners Manual
Please read the Owner’s Manual Completely BEFORE operating the unit
7
These techniques ensure that each
unit performs to the high standards
established in the development of
the original prototypes. This costly
process is reflected in the unprec-
edented 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 VTPH-2 Phono
Preamplifier to provide the high-
est musical satisfaction without the
artifacts produced by most other
tube-based components. This power
supply provides a rigid voltage
source to the tubes, producing
remarkable resolution of musical
events in time and sound stage. The
circuit board layout was engineered
with all of its electrical properties
considered in order to achieve fine
audio performance with greater
consistency than hand wiring.
Compromise was not an option. The
unique design of the Herron VTPH-2
Phono Preamplifier, along with its
conservative design and operating
parameters means that owners can
expect the industry’s highest level of
performance to be maintained over
the extended life of the unit.
Operating the Herron VTPH-2 Phono
Preamplifier is easy and straightfor-
ward. The unit has been designed
to be exquisitely simple and user
friendly, with its operational readi-
ness easily monitored. During the
manufacturing process, every unit
is subjected to a battery of qual-
ity control checks. Each unit is run
through a full forty-eight hour burn-
in, and then measurements are made
to make sure that it is functioning
correctly. Last and most importantly,
careful listening tests are made in
comparison to a reference unit, to
make sure each phono preamplifier
performs up to the strictest Herron
Audio standards.
The staff of Herron Audio are audio-
philes who regard the high-quality
reproduction of the performance of
music as one of the finest pursuits
in the engineering arts. We at Her-
ron Audio believe in the pursuit of
audio perfection. We hope you enjoy
the fruits of our efforts. If you have
any comments, suggestions, or
questions, please contact us at
314-434-5416.
VTPH-2 Vacuum Tube Phono Preamplifier Owners Manual
8
• Two operating modes: Moving Coil and Moving Magnet
• Separate RCA input connectors for Moving Coil and Moving Magnet
inputs
• Additional RCA connectors for external Moving Coil loading
• Moving Coil/Moving Magnet mode switch
• 15 second mute during mode change
• Cartridge bias Moving Coil input stage allows for infinite load resistance
(operation with cartridge unloaded)
• All-tube signal path (moving magnet mode)
• Passive RIAA equalization for accurate phase and amplitude response
• Available in two factory set tube configurations
• Class A operation
• Star grounding for low interference susceptibility and clean signal path
• Zero feedback—no feedback loops in the audio circuitry
• Low noise
• High input signal capacity without overload; see technical specifications
• Gold plated RCA and ground connectors
• Audio path capacitors are high quality metal film
• Hand-picked components for accurate response
• Automatic muting at startup and shutdown
• 78,000 mF of power supply energy storage capacitance
• 4 levels of high voltage regulation
• Regulated soft-start DC filament supply
• Regulated tube bias supply
• Toroidal power transformer
• Reversing power line (AC) polarity switch for minimizing line-to-chassis
reactive currents and noise pickup
• Controlled warm-up of tube filaments and high voltage for extended
tube life
• Low plate operating currents for extended tube life and cool operation
• Front panel indicators for power, voltage, and output (mute release)
• Each unit is given a 48-hour burn-in, including rigorous bench and
listening tests
Design Considerations
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