Herron Audio M1A Manual de usuario
Owner’s Manual
M1A
Power
Amplifier
M1A Power Amplifier Owners Manual
Table of Contents
General Safety, Installation, 1
and Operation Instructions
Important Safety Instructions 2
Warning 4
Important (UK only) Instructions 5
The Amplifier 6
Front Panel Features 7
Rear Panel Features 8
Installation 10
Troubleshooting 11
Technical Specifications 12
FCC Notice 13
Re-cycling 14
RoHS Compliance 14
©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
M1A Power Amplifier 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
M1A Power Amplifier 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.
M1A Power Amplifier 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.
M1A Power Amplifier 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.
M1A Power Amplifier 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.
M1A Power Amplifier Owners Manual
6
nance free and remains stable even
with a 1 micro-Farad capacitor con-
nected across the output terminals.
The M1A engenders the fine resolu-
tion and liquidity normally associ-
ated with tube amplification plus the
power and bass control of solid state.
Individual voices remain distinct
and clear amidst the crescendo full
orchestra and chorus. The sound
of the M1A is pure and true to the
source.
It has the clarity, focus in time, and
natural sound inherent in all Herron
Audio products.
DC Response
The M1A incorporates automatic
low level d.c. offset cancellation plus
high level d.c. shutdown speaker
protection circuits. The effects of
continuous low level d.c. at the
input of the M1A will be nulled out
over time and higher levels of d.c. at
the input will engage the shutdown
protection.
The Amplifier
The M1A is a full complementary
symmetry bipolar implementation
and contains no coupling capacitors
in the forward direction. It employs
the latest technology in wide band
output devices with enhanced low
level linearity. Proper stage-to-stage
impedance matching insures extraor-
dinarily low distortion and unique
successive stage to output confluence
provides a seamless combination of
micro/nano-resolution from forward
stages and robust controlled power
and authority from successive stages.
This unified current summation
drive stage network eliminates the
crossover notch problems common
in many solid state amplifier designs.
High idle current or class A bias
output stage operation is not neces-
sary! The M1A runs cool under most
listening conditions and provides a
live presentation with none of the
hardness normally associated with
solid state amplifiers. The output
network of this amplifier is reso-
The Amplifier
M1A Power Amplifier Owners Manual
Please read the Owner’s Manual Completely BEFORE operating the unit
7
The front panel has three indicator
lights for easily monitored opera-
tional readiness of the unit. The first
light is the “power” indicator. This
indicates that power has been turned
on. The “voltage” light indicates
that the amplifier circuitry has been
activated.
Upon shutdown the amplifier is
deactivated at the same instant that
the output relay is opened. This
prevents contact wear and contami-
nation from arcing which is com-
mon in conventional designs. The
approach used in the M1A prolongs
the life and sound quality of the
relay.
A blinking “voltage” light indicates
that there is d.c. present at the input
of the amplifier. The blue “output”
light indicates that the output relay
is engaged and the M1A is ready for
listening. If the M1A is overheated
(78 degrees Centigrade), the “out-
put” light and the “voltage” light
will turn off (amplifier deactivated)
until the heat sink cools 10 degrees
Centigrade. The normal start-up se-
quence of the unit is designed to run
a self check and accelerate the warm
up/break-in process.
Front Panel Features
M1A Power Amplifier Owners Manual
8
Output Terminals
The M1A has two gold-plated
speaker binding post terminals.
These terminals are labeled with the
designation “OUTPUTS” on the rear
panel of the unit.
The polarity is designated with red
and black insulating collars. The red
collar signifies the positive terminal.
The M1A is non inverting. Connec-
tion to the speaker binding post
terminals should only be made while
the unit is powered down.
The rear panel was designed for flexibility and ease of access to less frequent-
ly used functions. The high precision RCA input jack and output connectors
are gold plated to minimize signal degrading corrosion.
Rear Panel Features
Power Connection
An IEC power cord connector is
provided for attaching the Herron
Audio-provided power cord or an-
other chosen by the user.
Power Switch
When placed in the on position, the
unit is powered up. At power up, the
unit goes through a start-up se-
quence and remains muted until the
output light comes on. When the
switch is moved to the off position
the unit is automatically muted and
powered down.
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