Studio Projects VTB1 Manual - Manual (Page 2)

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WHY DO I NEED A
MICROPHONE PREAMPLIFIER
A microphone preamplifier takes audio signals from any microphone (XLR
socket), musical instrument or high level source (1/4 inch jack sockets), and
amplifies them up to 'line' level; that is, from a few millivolts, up to about a
volt. The phantom power supply (push-button switch) provides power to
capacitor microphones. Dynamic or ribbon microphones should be used
with the phantom power turned off, then full advantage can be taken of the
extreme low noise performance of this preamplifier.
DESCRIPTION / CARE
Your new VTB1 is a sturdy piece of equipment. It should not require much
care other than common sense. The VTB1 is built to stand up to the demanding
use of the professional. If you follow a few simple procedures, it will provide
you with years of trouble free service.
1) Keep the VTB1 in a dry dust free environment
2) Avoid blocking the air vents on the side panels
3) Never use an incorrect power supply other than the correct
voltage and amp rating
CONNECTING THE VTB1
The VTB1 can be used in many applications, from recording to live
applications. This section will help you get your new VTB1 connected as
well as explain the connections on the VTB1 to help you get the most from
your new unit.
INSTRUCTION BOOK CONTENTS
What is Studio Projects............................................................................................2
Why do I need a microphone preamplifier.................................................................3
Description, Care .....................................................................................................3
Connecting up..........................................................................................................3
Feature Control Descriptions....................................................................................4
Specifications ..........................................................................................................4
Circuit Topology........................................................................................................5
Problems ……………………………………………….........……………………….…..6
Origins and manufacture..........................................................................................6
Declarations of conformity........................................................................................6
Troubleshooting........................................................................................................6
User Specified Settings.............................................................................................9
WHAT IS STUDIO PROJECTS?
Studio Projects is a technology company. Armed with the idea that quality products do not have to
be expensive, Studio Projects set out to design and offer quality audio products at a price that is
affordable to most users. As a small sized company with lower expenses than its competitors,
Studio Projects is able to pass extra savings onto the end user, and provide a high level of quality
at a very competitive price.
When Studio Projects introduced its "C" Series microphones in 2001, both end users, reviewers,
and audio professionals acclaimed the quality and sound as nothing short of amazing. With the
introduction of the new "B" Series microphones in 2002, Studio Projects has pushed the envelope
even further supporting its quality and performance for an affordable price.
Now we are entering the electronic market and offer our first electronic product, the VTB1. This
unique product will offer the best possible quality and feature set in its price class. We hope you will
enjoy your new VTB1 as much as we have enjoyed making it for you.
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Studio Projects is manufactured and marketed
under the direction of:
PMI AUDIO GROUP
23775 Madison Street
Torrance, CA 90505
voice (310) 373-9129
facsimile (310) 373-4714
toll-free USA (877) 563-6335
Email [email protected]
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Before you connect anything to your new VTB1, be sure to turn down
all of the input and output levels. Plug in the supplied power adaptor.
Be sure to plug the barrel connector into the VTB1 first, and then plug
it into an electrical supply outlet. Using a good quality XLR cable, con-
nect your microphone to the VTB1 XLR input on the back of the VTB1.
Using either the XLR, or the 1/4" output, hook this into your recorder,
computer card, or whatever you are recording or playing into. Be sure
to turn the 48V phantom power switch to on if you are using a mic that
requires phantom power. Wait at least 60 seconds for the power to
charge your mic before turning up any gains. Set the meter selection
switch to input, and adjust the GAIN control to get a meter reading with-
in the 0 to +8 range. Then turn up the output control to feed your
recorder. When changing microphones or powering down, be sure to
turn down both input and output levels first. Then turn off the 48V
power and wait 60 seconds. Then it will be safe to turn unplug the unit,
or to change microphones. Use this method of powering up and down
each time you use the VTB1. It is best to wait about 30 minutes before
using the VTB1 to let the internal tube heat up to get the best out of the
unit.
CAUTION. When using UNBALANCED MICROPHONES DO NOT
USE PHANTOM POWER, It could damage the microphone and will
certainly cause noise on the output. An LED light shows on the front
panel as a warning that the phantom power is turned on.