Jas-Audio BRAVO 3.1 User Manual

JAS Bravo 3.1

Vacuum Tube Class A

Integrated / Power Monoblocks Amplifier

OWNER’S MANUAL

NOTE: Before installing your new Bravo 3.1 audio amplifiers, please read
this manual carefully. It will inform you of the product specifications and also
proper installation and operation p r o cedures.

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.jas­audio.com “.

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JAS AUDIO HIGH FIDELITY

Class A Monoblocks Amplifier System

Welcome to JAS Audio Family! This JAS Bravo 3.1 Inte grated/Power Mo noblocks
Amplifier is designed and manufactured to the highest quality standards. The
design exemplifies performance, elegance, and si mplicity. You w ill 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 3.1 OWNER’S MANUAL

Introduction

Thank you for purchasing the JAS Audio Bravo 3.1 Integrated / Power Monoblocks

Amplifier. This pair of monoblocks is of dual mono design fitted with 3 tube rectifiers, 3

chokes and a direct heated 3-pole 2A3 vacuum tube connected to the transformer for

driving the 805 vacuum tube so as to attain a power output of 32W per channel. This

single-ended class A integrated/power amplifier is truly amazing in sound reproduction

that presents a character of clarity, transparency, and dynamic sound reverberating in a

huge sound stage for hours of music enjoyment by audiophiles.

Preliminary

The front panel of Bravo 3.1 features an analog volume control knob and a power switch.

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They are of uniformity with the panel in color and material in production. Lined on both

sides of the front transformer cage with wooden cover are two rows of tubes, including one

row of rectifiers and another row of tubes on the other side for signal amplification, drive

805

stage and output stage. The

output tube is fitted on the antique “holdover–socket”, a

design that requires a gentle push downward and an action to turn in releasing the tube.

All

the transformers are housed in two separate cages mounted on the chassis as a T-joint.

Apart from the IEC power inlet and the taps for 4Ω and 8Ω impedance matching with

speakers, there is also a by-pass switch located at the back of the chassis. The

operating

mode is selectable by switching the by-pass switch left or right. Please make sure

that switches on both chasses are set to the same side so as to work on the same operating

mode before powering up the amplifier.

This pair of monoblocks is recommended to match with Bravo 1.1 vacuum tube pre-

amplifier of the same series to build a high-end set up for optimal performance.

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Power Switch Volume Control Knob

It is important to be careful with tube installation. Please do not force anything, easy

does it! This precaution is me ntione d to he l p you o btain p le asing r e sults a nd avoi d

damage! If you have any trouble replacing or changing tubes, please d on’ t hes itate t o

call your dealer!

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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 805 output tube and the 2A3 driver tube should last years in
the Bravo 3.1. The 6J4P input tubes and the 5Z3P rectifier tubes should last longer
though.

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