Jas Audio Bravo 2.3 User manual

OWNER’S MANUAL
JAS Bravo 2.3
Vacuum Tube
Single-Ended Class A
Integrated Amplifier
NOTE: Before installing your new Bravo 2.3 audio amplifier, please read this
manual carefully. It will inform you of the product specifications and also proper
installation and operation procedures.
For additional requests
If you have any additional questions regarding the installation
or operation of our products, you are welcome to contact us directly via
email: “ [e-mail] “, and please check frequently our JAS Audio
official website: “ http://www.jas-audio.com “.
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JAS AUDIO HIGH FIDELITY
Single-Ended Class A Integrated Amplifier
Welcome to JAS Audio Family! This JAS Bravo 2.3 integrated amplifier is designed
and manufactured to the highest quality standards. The design
exemplifies performance, elegance, and simplicity. You will find this tube amplifier
visually pleasing and easy to use without going through pages of instructions.
IMPORTANT: before operating the unit, make sure that you are familiar with the safety
measures documented below.
Bravo 2.3 OWNER’S MANUAL
Introduction
Thank you for purchasing the JAS Audio Bravo 2.3 Integrated Amplifier. Standing on the
chassis immediate in front of the transformer casing are two 5AR4 rectifier tubes. On either
ends of the front row are 6C33 drive stage tubes separated by two 6J4P input stage tubes in
the middle. The transformer cage and the tube platform on the chassis are both overlaid with
hand finished solid wooden board engraved with scripts of Bravo and a thick acyclic sheet
engraved with tube notations and other indications respectively. The decorations and
indications are intended to put an appearance of stylish and elegance in front of audience.
Made of aluminum alloy, the front panel of 8mm in thickness is also a representation of
coherence in design of making the chassis robust and the electronics working with
durability.
6C33
5AR4
6J4P
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Preliminary
The front panel of Bravo 2.3 features a step-less negative feedback knob that regulates
amount of signal feedback in music playing for meeting individual preferences. Signal input
to 4 sets of RCA female plugs is selectable by the selector on the right of the panel. Power
switch is located on the left of the panel.
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Negativefeedbackknob Selector
It is important to be careful with tube installation. Please do not force
anything, easy does it! This precaution is mentioned to help you
obtain pleasing results and avoid damage! If you have any trouble
replacing or changing tubes, please don’t hesitate to call your dealer!
Tube Replacement
Caution: Make sure the amplifier has been unplugged for 30 minutes from the AC
mains before replacing the tubes. This is to avoid any risk of shock or discomfort from
high temperature. Although tube life span varies depending on the nature and degree of
use, the 6C33 output tubes and the 6J4P driver tubes should last years in the Bravo 2.3
under normal home use.
Cautionary Terms
When the following cautionary terms are used in this manual, these
definitions apply:
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
NOS types of 6C33, 6J4P, 5AR4 tubes will work fine in the JAS Bravo 2.3 amplifier.
The amplifier voltage settings will also work fine with all compatible types.

NOTE: LOOK CAREFULLY at the tube pins and socket and make sure
that pins of all tube are inserted correctly. In most cases, replacing
tubes presents no problem. The tube can be made to release by
pulling it out gently (sometimes with a little back and forth wiggling).
Nevertheless, it is possible to force the tube pins into the socket the
wrong way! If you install the tube wrongly, you will probably damage
the amplifier and the tubes. This kind of damage will not be covered
by the manufacturer’s warranty. If you have any doubt about this,
please call your local dealer for help.
Unpacking before installation
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 carrier immediately.
Caution: On reception, carefully remove your new Bravo 2.3 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.
Installation Setup and Power ON Operation_
Three-way taps provide output to the speaker system (4 or 8 ohm connections). Power
Requirements: The Bravo 2.3 is designed to operate from the AC mains (house current)
and is factory pre-set according to voltage supply of the import region. A standard IEC AC
power inlet with a built-in fuse is provided on the back panel of the chassis.
Caution: There is a power on-off knob located on the left of the Bravo front
panel. When it is at Power On position, the output tubes will light up.
Power ON Operation
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Before power on, set the volume knob all the way down manually. Your new amplifier is
ready for operation after the speaker cables, interconnect cables and tubes have been
correctly installed. After power on, volume can be adjusted by the remote control. We
recommend extreme high quality silver cables for speaker, interconnect, and power
connections. Please ask your local dealer for additional information.
Features
ƒ Single-Ended Class-A circuitry offers harmonic purity and sonic transparency
ƒ Selected and matched 6C33, 6J4P, 5AR4 tubes
ƒ Separate wide-band audio power and output transformers
ƒ All transformers are electrically isolated and mechanically shock-mounted
ƒ Additional internal damping material for added control of mechanical resonance
ƒ 4 and 8-ohm output impedance taps for optimum speaker impedance matching
ƒ Factory pre-set on voltage operations with fuse protects amplifier circuit in case of
current overload
ƒ Supplied with a remote control
ƒ Bravo series tube amplifiers are handcrafted to meet high quality standards
Running-In Period
The tubes, capacitors and the output 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 phenomenon is
true of most high performance audio amplifiers .
Aftercare
The chassis may be cleaned with a soft towel cleaner. The frequency of cleaning will be
governed by cleanliness of the operating environment. Spray the cleaner on the towel, not
on the amplifier! Avoid abrasive cleaners! Feather dusters are
good for cleaning the
amplifier.
Limited Warranty
This product has been designed and manufactured to the highest quality and standards.
However, if something does go wrong with this product, JAS Audio and its national

distributor warrant, free of charge, labor (exclusion may apply) and replacement parts in
any country
served by an official JAS Audio distributor.
This limited warranty is valid for a period of 2 years from the date of
purchase of an amplifier or six months for vacuum tubes.
Terms and Conditions
1. The warranty is limited to the repair of the equipment. Neither transportation, any
other costs that may be incurred during transportation, nor any risk involved
in removal, transportation and installation of products is covered by this
warranty.
2. This warranty will not be applicable other than in case of defects in materials and/or
workmanship at the time of purchase. Should any of the following conditions occur, it
will also make this warranty not applicable.
a. for damages caused by incorrect installation, connection or packing;
b. for damages caused by any use other than those described as proper in the user
manual, or by negligence, or by modifications, or by use of parts that
are not made or authorized by JAS Audio;
c. for damages caused by faulty or unsuitable auxiliary equipments;
d. for damages caused by accident, lighting, water, fire heat, war,
public disturbances or any other cause beyond the reasonable control of JAS Audio
and its appointed distributors;
e. for products whose serial number has been altered, deleted, removed or made
illegible;
f. if repairs or modifications have been performed by an unauthorized person.
3. This guarantee complements any national/regional law obligations of dealers or
national distributors and does not affect your statutory rights as a customer.
How to Claim Repairs under Warranty
Should service be required, please follow the procedures listed below:
1. If the equipment is being used in the country of purchase, you should
contact the JAS Audio authorized dealer from whom the equipment
was purchased.
2.
If the equipment is being used outside the country of purchase, you
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should contact JAS Audio national distributor in the country of residence.
They should be able to advise where
the equipment can be serviced.
TO VALIDATE YOUR WARRANTY, YOU WILL NEED THE ORIGINAL
SALES INVOICE OR OTHER PROOF OF
OWNERSHIP AND DATE OF
PURCHASE.
Technical Specifications
Product Model: JAS Bravo 2.3
Description: ClassATubeAmplifier
Technical Features: Single-Ended Class-A Circuit Topology
Power Requirement: AC 110-117, 220-240 @ 50/60 Hz factory pre-set for
local voltage supply
PowerOutput: 15WX2@（4
Ω , 8 Ω ）
Input Sensitivity: 0.67V for 15W
Input Impedance: 47K
Ω
Frequency Response: 10Hz --- 42 KHz (- 3dB)
Total Harmonic Distortion: ≤1% (8W)
S/Nratio: >86dB
Tube complement: 6C33 x 2, 6J4P x 2, 5AR4 x 2
Static Power Consumption: ≤240W
Chassis Dimensions: 430mm (W) X 335mm (D) X 170mm (H)
Packing Box Sizes: 540mm (W) X 460mm (D) X 330mm (H)
Net Weight: 23Kg
Gross/Shipping Weight: 25Kg
JAS AUDIO is constantly striving new design improvements, we reserve the
right to change or modify product specifications without prior notice or
obligation.
Note: All Bravo 2.3 amplifiers have their own serial number (S/N xxxxx)
marked on the back of the chassis and also printed on the exterior of the
packing box.
Happy Listening to all music lovers!
Best Regards
,
Set Your Mind Free !
Version 2.0 and Copyright
© Jan 2008 JAS AUDIO
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