OWNER`S MANUAL JAS Bravo 2.4
Contents
1. 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 KT88 12AT7 12AU7 5Z3P tubes will work fine in the JAS Bravo 2 4 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 you insert the pins 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 aa damage the amplifier and the tube This kind of damage will not be covered by the manufacturer s warranty If you have any doubts at all about this please call your local dealer for help Page 3 of 6 http www jas audio com 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 fou2. amplification are in the middle Overlaid with hand finished solid wooden board engraved with the Bravo logo and other indications a stylish and elegant appearance is put in front of the audience Made of aluminum alloy the front panel of 8mm in thickness is a representation of coherence in design of making the chassis robust and the gear working with durability Page 2 of 6 http www jas audio com Preliminary Bravo 2 4 features an aluminum alloy panel of 8mm in thickness that holds the on off knob on the left analogue volume control knob in the middle and the selector on the right Signal input to four sets of RCA connectors is selectable by turning the 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 to avoid any risk of shock or discomfort from high temperature Although tube life span varies depending on the nature and degree of use under normal home use the KT88 output tubes the 12AT7 driver tubes and the 12AU7 signal amplification tube should last years in the Bravo 2 4 Cautionary Terms When the following cautionary terms are used in this manual these
3. statutory rights as a customer How to claim repairs under warranty Should service be required please follow the following procedure l 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 should contact JAS Audio National distributor in the country of residence who will advise where the equipment can be serviced Page 5 of 6 http www jas audio com TO VALIDATE YOUR WARRANTY YOU WILL NEED THE ORIGINAL SALES INVOICE OR OTHER PROOF OF OWNERSHIP AND DATE OF PURCHASE Technical Specifications Product Model Description Technical Features Power Requirement Power Output Input Sensitivity Input Impedance Frequency Response Total Harmonic Distortion S N ratio Tube complement Static Power Consumption Chassis Dimensions Packing Box Sizes Net Weight Gross Shipping Weight JAS Bravo 2 4 Vacuum Tube Amplifier Push pull circuit topology AC 110 117 220 240 50 60Hz set factory pre set for matching mains supply 50W X2 4Q 8 QL 0 67V for 50W ATKQ 10Hz 0 5dB 80KHz 3dB lt 1 90dB KT88 x 4 5Z3P x 2 12AT7 CV455 x 2 12AU7 x 1 lt 180W 430mm W x 330mm D x 185mm H 540mm W x 470mm D x 310mm H 20 Kgs 21 5 Kgs E JAS AUDIO is constantly striving new design improvements we reserve the W right to c
4. OWNER S MANUAL i a L L JAS AUDIO 4 JAS Bravo 2 4 Vacuum Tube Integrated Amplifier NOTE Before installing your new Bravo 2 4 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 lf you have any additional questions regarding the installation or operation of our products you are welcome to contact us directly via email enquiry jas audio com and please check frequently our JAS Audio official website http Awww jas audio com Page of 6 http www jas audio com JAS AUDIO HIGH FIDELITY Integrated Amplifier Welcome to JAS Audio Family This JAS Bravo 2 4 integrated amplifier is designed and manufactured to the highest quality standards The design denotes 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 you are familiar with the safety measures documented below Bravo 2 4 OWNER S MANUAL Introduction Thank you for purchasing the JAS Audio Bravo 2 4 Integrated Amplifier Standing on the chassis immediate in front of the transformer casing are two 5Z3P rectifier tubes On either side of the chassis are two KT88 drive stage tubes for each channel output whereas the two 12AT7 driver tubes and the only 12AU7 tube for signal
5. band audio power and output transformers All transformers are electrically isolated and mechanically shock mounted Additional internal damping material for added control of mechanical resonance 4 and 8 ohm output impedance taps for optimum speaker impedance matching en e n hn Factory pre set on Voltage Operations with fuse protects amplifier circuit in case of current overload f 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 Page 4 of 6 http www jas audio com 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 the cleanliness of the operating environmental Spray the cleaner on the towel not on the amplifier Avoid abrasive cleaners Feather dusters are good for cleaning the amp 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 a
6. hange or modify product specifications without prior notice or obligation Note All Bravo 2 4 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 1 3 and Copyright Oct 2009 JAS AUDIO Page 6 of 6 http www jas audio com
7. nd 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 4 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 and Set up Three way binding posts provide output to the speaker system 4 or 8 ohm connections Power Requirements The Bravo 2 4 1s designed to operate from the AC mains house current and is pre set in the factory according to local supply of the import region A standard IEC AC power socket with a built in fuse 1s provided on the back chassis panel 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 Your new amplifier is ready for operation after the speaker cables interconnect cables and tubes have been correctly installed We recommended extreme high quality silver cables for speaker interconnect and power connections Please ask your local dealer for additional information Features f Push pull circuitry for dynamic sound with a balance in definition and texture in sonic performance Selected and matched KT88 12AT7 and 5Z3P tubes Separate wide
8. nd its national distributors 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 nor any other costs 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 and will not be applicable a for damages caused by incorrect installation connection or packing b for damages caused by any use than described in the user manual or by negligence or by modifications or by use of parts that are not made or authorized by JAS Audio for damages caused by faulty or unsuitable auxiliary equipments 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 ifrepairs or modifications have been performed by an unauthorized person 2 3 This guarantee complements any ed tt law obligations of dealers or national distributors and does not affect your
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