Shure VA 300 - Manual (Page 9)

A phone jack marked “Reverb Switch” (17) is located on
the rear panel of the console. This jack parallels the Master
R e v e r b I n - O u t s w i t c h ( 4 ) a n d a l l o w s t h e r e v e r b t o b e
remotely turned on and off when the Master Reverb switch is
in the “In” position. The Master Reverb switch will always
override the remote switch and turn off the reverb, so care
should be taken to insure that the Master Reverb switch is in
the “In” position if an external remote switch is desired to
control the reverb switching.
Since the remote switching is D.C., and no audio appears on
this jack, any length of unshielded cable can be used between
the Console and the remote switch without hum or noise. The
remote switch can be any single pole, single throw switch.
To Tape Recorder:
A phone jack on the rear panel marked “To Tape Recorder”
is provided for connections to tape recorders for making
recordings, or to additional power amplifiers, such as the
PM300. For specific instructions for such connections see the
section marked Special Operating Instructions.
The signal at this jack is the same signal that drives the
Console power amplifier and is considered to be an auxiliary,
high impedance output for driving high-level, high impedance
inputs. Note that all the Console controls, Master Volume,
Antifeedback, Reverb, etc., affect this signal.
VA300 Vocal Master
SPECIAL OPERATING INSTRUCTIONS
Echo:
Echo may be introduced into the VA300-C by using an
accessory echo device (such as an Echolette or Dynacord).
To use an external echo device in conjunction with the
VA300, interconnect the two units as follows: attach low
capacitance, single conductor, shielded cable to the Console
jack marked Echo “To Input.” Connect the opposite end of
this cable to the echo device jack marked “Input” (Aux. High
Level). Connect a similar cable to the echo device jack marked
“Output” (Aux. High Level) and connect the opposite end of
this cable to the Console jack marked Echo “To Output.”
Using the “Echo Gain” Control in conjunction with the
l e v e l c o n t r o l s o n t h e e c h o u n i t , t h e e c h o s i g n a l m a y b e
balanced with the gain of the VA300 so there is no change in
level when the individual Reverb In-Out switches are operated.
When connected in the manner described, the individual
channel Reverb In-Out switches will offer selective echo in
addition to selective internal reverb. With the Master Reverb
In-Out switch in the “Out” position, the individual channel
Reverb switches will select “dry” (no echo) in the “In” posi-
tion and “Echo” in the “Out” position.
Changing the Master Reverb In-Out switch to the “In” po-
sition will permit selection of echo (individual channel Reverb
switch “Out”) or reverb (individual channel Reverb switch
“ I n ” ) .
The output signal of the VA300-C at the jack marked Echo
“ T o O u t p u t ” is considered high level and is suitable for use
with loads of 10 kilohms or greater. The jack marked Echo
“To Input” presents a 40 Kohm load to the source and will
accept high level signals. Some echo units employ inputs
suitable only for very low level; in such cases, a resistance pad
(attenuator) will be required in the line from the VA300-C to
the echo device input. If the echo device input is suitable for
only high impedance microphones a resistive pad consisting of
a 100 kilohm and a 3.3 kilohm resistor is required. (See figure
4). Almost all makes of echo units use different output levels;
these may generally be compensated for by use of the gain
Figure 4
controls on the echo unit and the “Echo Gain” control on the
Console.
Tape Recording:
T o t a p e r e c o r d t h e V A 3 0 0 o u t p u t , c o n n e c t a l o w
capacitance, single conductor, shielded cable (such as Belden
# 8 4 0 1 , # 8 4 1 0 , # 8 4 1 1 ) f r o m t h e j a c k m a r k e d “ T o T a p e
Recorder” to the Auxiliary High Level Input of the tape re-
corder.
Limit the cable length to 15m (50 ft) to avoid loss of high
frequency signal and to reduce the possibility of hum pickup.
Use the tape recorder controls to set recording levels. Note
that the VA300 Master Volume control affects the signal level
a t t h e “ T o T a p e R e c o r d e r ” j a c k . T o m a k e s t e r e o t a p e
recordings see the section on stereo operation, on page 12.
Playing Tapes:
To play back tape recorded material through the VA300,
connect a cable from the tape recorder’s High Level Output to
one of the six Input jacks on the Console. Set that channel’s
Input Attenuator Switch to “Inst.” Individual channel Treble
and Bass controls should be set to 12:00 o’clock.
The individual channel Volume Control may be used, in
conjunction with the tape recorder playback level control, to
adjust volume.
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