Raven Audio Shadow Line-Stage User manual

©2014 Raven Audio. All Rights Reserved. MADE IN USA
User Guide
Shadow Line-Stage Preamplifier

VACUUM TUBE ASSEMBLY DIAGRAM
Congratulations on your purchase of the Shadow Line-Stage
Preamplifier. Locate the preamp with air circulation in mind,
although the preamp uses small signal tubes and runs relatively
cool. The heart of all separate-component systems is the
preamplifier, so the Shadow Line-Stage is hand-wired
point-to-point with silver-plated PTFE-coated conductors. It
features an ALPS 20k ohm volume control that can be upgraded
to a 50k ohm motorized Tokyo Ko-on volume control or manual
attenuator upon request. The preamplifier is tube-rectified with a
solid-state power supply and matches well with a wide variety
of amplifiers. The standard Shadow Line-Stage gain is 3dB but
can be modified upon request.
PRODUCT DETAIL
Specifications
Inputs: 1/pr balanced XLR, 4/pr single-ended RCA
Output impedance line-stage: < 200 ohms
Output gain: +3dB
Dimensions: W 19.4" x D 11.5" x H 5"
Weight: 42lbs
Tube Complement
1 x 6X4 – Rectifier
1 x 6BM8 – Constant voltage regulator
2 x 12AT7 – First-stage amplifier
2 x 12AU7 – Current supply first-stage amplifier
2 x 6DJ8/6922 – Preamp output stage cathode followers
IMPORTANT: USING YOUR VACUUM TUBE AMPLIFIER
• Do not unplug an interconnect while the preamplifier is on
• Do not plug your preamplifier into an ungrounded power socket
• Be sure to turn on source components and preamplifier first
• Allow them to warm up before turning on your amplifier(s)
• Mute the preamp and turn the amp on last
• Mute the preamp and turn the amp off first
• Always use the correct tube types available from Raven
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PLEASE READ AND FOLLOW THESE
IMPORTANT SAFETY PRECAUTIONS
WARNING: AC Voltage
Do not plug this Raven Audio device into a power outlet differing
in configuration or voltage from the source indicated for safe use
on the device. If you don’t know the type of electrical power that
is supplied to your home, please consult your local power utility
company for further information.
WARNING: Grounding and Polarization
Your Raven Audio device has a three-prong grounding-type AC
plug. This plug is designed to be inserted into a grounding type
outlet only. If this plug doesn’t fit directly inside your outlet, do
not attempt to force it into the outlet.
Never attempt to disassemble or modify the plug in any way or
to use an altered extension cord to make it fit into a two-prong
outlet. The grounding feature is a necessary and important
safety and design feature.
Do not attempt to circumvent it by using a 3-to-2 prong adapter.
If you do not have a properly grounded three prong outlet
available, call a local electrician to install one. Proper grounding
techniques as specified in section 810 of the National Electrical
Code (NEC), AASI/NFPA 70 (in Canada, part 1 of the
Canadian Electrical Code). Doing so will provide protection
against voltage surges and static charges.
WARNING: Cleaning
The only cleaning necessary for your Raven Audio device is a
light, dry dusting. Do not use any type of liquid or aerosol
cleaners and unplug the device from the wall before cleaning it.
WARNING: Liquid – Avoiding Electrical Shocks
Do not operate your Raven Audio device if liquid of any kind is
spilled onto or inside the unit. Do not operate your Raven Audio
device near liquid of any kind spilled, condensed, or contained.
Do not operate your Raven Audio device in the bathroom, kitchen
or anywhere near a sink or bathtub.
WARNING: Power Cord Safety
If the protective jacket of the power cord begins to wear or fray
and any internal wiring is exposed, immediately disconnect it
from the Raven Audio and discontinue use. Do not route any of
the incoming or outgoing cables from your Raven Audio device
place in heavy foot traffic which could cause undue wear, strain
or cause a tripping hazard.
CAUTION: Exposure to Heat
Do not expose your Raven Audio device to direct sunlight or
place it near heat sources or in any enclosed space prone to
uncontrolled high temperature.
WARNING: No User Serviceable Parts Inside
If, for any reason, your Raven Audio device does not operate
properly, never open the unit or attempt to service it yourself in
any way. There are no user serviceable parts inside. Unplug the
unit and contact the manufacturer for further assistance.
CAUTION: Proper Power and Protection
To deliver clean power to your equipment, every single wire Into,
or out of your equipment must be connected to an appropriate
Raven Audio device. There can be no other pathway into, or out
of your system. This includes all power, signal, control, antenna,
data, phone, internet, cable or other connection to all
components within the system.
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