Jas-Audio BRAVO 1.1 LE PRE-AMP - Manual (Page 7)

Page 7 of 9
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tubes light up after pressing the power switch at ON position while the Gain Control
Knob on the main box is at 0dB or 3dB.
Power ON Operation
Your new pre-amplifier is ready for operation when the tubes are properly installed, and
the input interconnect cables from the source and those for connecting the power
amplifier are properly connected.
We recommend high quality silver cables for interconnects and high purity copper
conductor cables for power connection. Please ask your local dealer for additional
information.
Features
ƒ Vacuum Tube Pre-amplifier for high quality and definition in sonic performance
ƒ
Selected and matched pairs of 12AX7 and 12AT7 tubes
ƒ Separate wide-band audio power transformers
ƒ 2 sets of chokes for regulating passage of high and low frequency signal flow
ƒ Designed with a separate power supply for eliminating electro-magnetic interference,
and the transformer is mechanically shock-mounted in the box
ƒ Additional internal damping material for added control of mechanical resonance
ƒ 4 sets of RCA female plugs for signal input and 2 sets of RCA female plugs for
signal output
ƒ Factory pre-set on Voltage Operations with fuse protects amplifier circuit in case of
current overload
ƒ Bravo Tube Pre-amplifiers are handcrafted to meet high quality standards
Running-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 phenomenon is true
of most high performance audio amplifiers.
Aftercare