Navison audio NVS-003G Manual instruction

Navisonaudio
The natural sound
NVS - 003G

NOTE: Before installing your new power amplifiers, please read this manual carefully as it will inform
you of the product specifications, proper installation and operation procedures. Included in
this manual are guidelines on how to properly install the tubes.
Navisonaudio
The natural sound
Mono Power Amplifier
Setup and Operation Manual
NVS - 003G
NVS-003G Owner’s Manual 1

CIRCUIT TYPE : OTL Class A Triode
POWER OUTPUT : 75 watts channel in to 8 ohms
FREQUENCY RESPONSE : 10Hz - 25KHz
NOISE : - 75dB below full output
INPUT SENSITIVITY : 2,5V for full power output
TUBE COMPLIMENT : 4 - 6C33C-B output tubes 
2 - 6SN7 driver tubes 
1 - 6SN7 input tube
OUTPUT IMPEDANCE : 8 ohm speaker connection (Recommend)
INPUT POWER REQUIREMENTS : 115 or 230V 50 - 60Hz, set by market
POWER CONSUMPTION : Min 250 watts, max 650 watts
DIMENSIONS : 9.05“H x 14.96“W x 27.17“D
(23 cm x 38 cm x 69 cm)
NET WEIGHT : 66 Lbs. (30 kg.)
SHIPPING WEIGHT : 77 Lbs. (35 kg.)
POWER TRANSFORMER : Toroidal transformer with 200% duty cycle
CAPACITORS : Oil paper
AC POWER CORD : IEC standard plug, detachable cord
WARM-UP TIME : 10 minutes
BREAK-IN PERIOD : 100 hours of music playing time
Specifications are subject to change or improvement without notice or obligation.
Specifications
NVS-003G Owner’s Manual
2

Cautionary Terms
When the following cautionary terms are used in this manual, these definitions apply:
WARNING!
Electrical hazard! Misuse or failure to follow instructions properly may result in personal injury
or death!
CAUTION:
No risk of personal injury; however, misuse or failure to follow instructions may result in damage
to equipment.
NOTE:
No risk of personal injury or equipment damage, however, misuse or failure to follow instructions
may prevent proper performance equipment.
Top Panel Features
OFF-ON TOGGLE SWITCH: Turns AC power on in the rear position. The output tube, driver tube
and input tube will light at this point.
Rear Apron Features
INPUT : Signal input connection via shielded RCA interconnect cable.
OUTPUT : One 5-way binding posts provide output to the speaker system for
8 ohm speaker connections.
AC POWER FUSE : Never replace with any other value than 15 AMP SLOW BLOW FUSE
with 115 Volt Rating.
TUBE FUSE : Never replace with any other fuse than - amp FAST BLOW FUSE!
NVS-003G Owner’s Manual 3

Installation
This section describes the unpacking and installation procedures for your new amplifier.
Unpacking
All shipping containers have been specially designed to protect their contents and special care
has been taken to prevent damage under normal shipping conditions. Mishandling should be
evident upon inspection of the shipping container. If shipping damage is found after visual
inspection, take care not to destroy the evidence. If necessary, document the damage with
photographs and contact the transport carrier immediately.
Carefully remove your new NVS-003G from its packing carton and examine it closely for signs
of shipping damage. It is recommended to save all original packing cartons and crates to protect
your amplifier from damage should you wish to store it or ship it for after - sales service.
Physical Placement
The NVS-003G is designed for use in homes. It must be protected from the elements and
temperature extremes. For example, avoid placing the unit in extremely hot locations such as
near radiators or other heating units. Its location among the user’s audio components is not
critical; however, certain precautions must be taken. Avoid moisture, direct sunlight,
and dusty areas.
Power Requirements
The NVS-003G is designed to operate from house current AC mains. The design voltage is 115
Volts AC at 50/60Hz (Export units 230 Volts AC at 50/60Hz, by market).
Speaker Cables
The speaker cables from the output posts of the NVS-003G to the speaker system can be any
length that your setup requires. Select speaker cables of sufficient size to preserve the outstanding
performance capabilities and sound quality of your new power amplifiers. Heavy duty #14 gauge
wire is suitable for distances up to 15 feet; #12 gauge is good for 25-30 feet. Most audio dealers
have high performance speaker cable in stock for this purpose. We strongly urge you to try
several types to find the best ones for your combination of components and speakers.
NVS-003G Owner’s Manual
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Interconnect Cables
Signal input connection is made via the RCA input jack on the rear of the amplifier located next
to the output binding posts. Set the input selection switch to indicate the desired input connection
RCA. The input interconnect cables from the output of the preamplifier can be any length your
installation requires. A shielded high quality interconnect cable is important to reduce chances
for hum or interference. Ask your Authorized Navison audio dealer for advice.
Operation
Your new amplifier is ready for operation after the speaker cables, interconnect cables and the
tubes have been installed.
WARNING!
Off-On Power Toggle Switch
Push the AC toggle switch toward the rear, to the “ON” position. The 6SN7 input tubes, 6SN7
driver tubes and the 6C33C-B out put tubes will light up in this setting.
‘Break In’ Period
The tubes, capacitors and the transformers take approximately 100 hours of music playing to
fully settle in for peak performance. Small imperfections in the tube surfaces will ‘boil off’ during
the break in period as well. The amplifier will sound good right out of the box but it will improve
as break in occurs. After the first couple of hours you will notice increased depth and tighter
bass. This break in period is true with most high performance audio amplifiers.
Cleaning and Care of Finish
The chassis may be cleaned with a soft towel and Windex®or a similar gentle window cleaner.
The relative frequency of cleaning will be governed by operating environmental cleanliness. Spray
the cleaner on the towel, not on the amplifier! Avoid abrasive cleaners! Feather dusters are good
for cleaning the amp and the tubes when it is cool, not when ON.
NVS-003G Owner’s Manual 5

Replacing Vacuum Tubes
If it becomes necessary to replace the tubes, the same brand as installed new should be used.
A complete new tube kit is available from Navison audio Design. Although useful tube life varies
depending on the nature and degree of use, under normal home use, the 6C33C-B output tubes
should last many years in the NVS-003G. The 6SN7 driver and input tubes should last
even longer.
NOTE: Any current production or New Old Stock (NOS) types of 6C33C-B, 6SN7GT tubes will
work fine in the NVS-003G amplifier. The voltages are fine for all available types.
WARNING!
Make sure the amplifier is unplugged 30 minutes from the AC mains before replacing the tubes
to avoid risk of shock and high heat from the 6C33C-B output.
WARNING!
Make no attempt to put the NVS-003G in service with the chassis open! Contact with the high
voltages found inside the chassis can be fatal! Remove the AC power plug from the wall and
allow 30 minutes for thehigh voltage capacitors to discharge through bleeder resistors
beforeattempting to change the tubes or to clean the inside the amplifier.
CAUTION:
Never remove or insert the AC plug when the unit is on or the AC power switch is in the
“ON” position.
Obstruction of the top portion of the amplifier will result in the tubes overheating.
NVS-003G Owner’s Manual
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NVS-003G Owner’s Manual 7
Limited Warranty For Navison audio Components
Navison audio design, inc.will provide service under warranty to the original owner on
products sold new in the United States for the lesser period of three years from the date of
purchase by the original purchaser, or five years from the date of shipment to the authorized
Navison audio dealer. During the warranty period, Navison audio will repair defective units without
charge for labor or parts (with the exception of vacuum tubes and batteries).
Exclusions. The following are not covered under this warranty:
a) Units which have been damaged by misuse, abuse, or accident.
b) Units which have been modified, altered, or improperly repaired by anyone not specifically
authorized by Navison audio design, Inc.
c) Units not purchased from an authorized Navison audio dealer in the United States for use
in the United States.
d) Normal wear.
e) Incidental or consequential damages are not covered under this warranty. Some states
do not allow the exclusion of incidental or consequential damages, so this exclusion may
not apply to you.
Obtaining Warranty Service: To obtain warranty service, the unit must be shipped, along
with evidence of purchase, in factory packing to Navison audio design (or designated service
center) with freight and insurance prepaid by the owner. After repair, the unit will be returned with
freight and insurance prepaid by Navison audio design to any destination in the United States.
All implied warranties, including merchantability and fitness for a particular purpose are limited
in duration to the duration of this express warranty. Some states do not allow limitations on the
duration of implied warranties so the above limitations may not apply to you.
The warranty on the Navison audio of products is transferable to subsequent owners provided
that the warranty registration card has been filled in and returned to Navison audio design, inc.
within 30 days of the original purchase, and that the registered owner provides the factory with
a signed notice giving model and serial number of the unit, and the new owner's name and address.
This warranty gives you specific legal rights and you may also have other rights which vary from
state to state.
Navison audio products purchased outside the United States are covered by warranty terms of
the importing distributor in the country in which the product was originally purchased, which may
differ from the terms set out herein. Importing distributors are not obligated to provide warranty
service for products originally purchased outside their country. Navison audio will provide warranty
service for products outside the United States, but in these cases, the customer must pay all
shipping, handling and customs costs both to and from our Service Department.

Questions about this warranty should be addressed to
Service Department
Navison Audio Design, Inc.
1551 Shaw Drive San Jose CA 95118.
The Navison audio service department can also be reached by
• Email: [email protected]
• Phone: [phone]
• Fax: [phone]
Toll free number
• 1-877-NAV-IZON or (628-4966)
Service
If your Navison audio component requires service, repack it using the original box and packing
material and ship to the Service Department address above. Boxes and packing materials can
be obtained from our service department for a nominal charge, if you no longer have yours.
Include with the unit a note describing the problem you are having in as much detail as possible.
It is especially important for our technician to know if the problem is intermittent. If you want an
estimate of cost for out of warranty service, be sure to request it in this note. Be aware that
requesting an estimate will delay service to your unit as we will have to contact you for your
approval before commencing service.
Registering The Warranty
Please return the enclosed card to the factory within 30 days of purchase to register the warranty.
NVS-003G Owner’s Manual
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Thank you for selecting the NAVISON AUDIO
products for your audio system.
www.navisonaudio.com