Shure VA 300 Service Manual download pdf (Page 10)

Phonographs:

To connect a” phonograph having a magnetic cartridge, and

no preamplifier, to the VA300, attach a cable from the

phonograph output to one of the six Input jacks on the

Console. Set that channel’s Input Attenuator Switch to the

“Mic.“ position. Set the Treble control for that channel at

9:00 o’clock and the Bass control at 3:00 o’clock to provide

approximate R.I.A.A. phono equalization. Use the individual

channel Volume Control to adjust the volume from the phono-

graph.

To connect a phonograph having a magnetic cartridge, and a

phono preamplifier, to the VA300, connect a cable from the

phono-preamplifier output to one of the six individual channel

input jacks on the Console. Set that channel’s Input

Attenuator Switch to “Inst.” Set the Treble and Bass controls

for that channel to 12:00 o’clock. Use the individual channel

Volume Control in conjunction with the phonograph’s level

control, to adjust the volume.

For stereo phonographs see the section on Stereo

Operation.

Musical Instruments:

Most electrified musical instruments may be amplified

through the VA300 with great effectiveness. Generally the

output of electrified instruments is greater than the output of

a dynamic microphone and therefore the individual channel

Input Attenuator Switches should be set to “Inst.” to avoid

exceeding the preamplifier input clipping level. See the section

on Input Connections for further information.

Electrified instruments may then be connected directly to

the individual Input jack. If low volume occurs, return the

Input Attenuator Switch to the “Mic.” position.

Low Impedance Microphones:

Low impedance microphones may be used with the VA300

when accessory matching transformers (Shure Model A95UF)

are added to the Input jacks (22).

The Shure Model A95UF Line Matching Transformer is

terminated at the high impedance end with a locking-type

phone plug for direct connection to the input jack; the low

impedance end is terminated with a Cannon-type, 3-pin female

connector.

The main advantage of low impedance microphones is that

virtually unlimited cable lengths may be used, whereas high

impedance microphones require that cable length not exceed

6m (20 ft).

Low impedance microphones should be wired using low

capacitance, two-conductor, shielded cable (such as Belden

#8413, #8422). When wiring Cannon-type connectors,

the cable shield should be connected to Pin No. 1 and one of

the two conductors to Pin No. 2, the other conductor to Pin

No. 3. When using several microphones, consistency of cable

wiring should be followed to insure that all microphones are

“in phase.“

To test two microphones and their cables for proper

phasing, connect them to the VA300. Talk or sing into the

two microphones while holding them 8 to 10 cm (3 to 4 in.)

apart. The amplified sound from the Speaker Column will be

the same when talking directly into either microphone or

directly between them if they are in phase with each other. If

the sound drops drastically, or a dead spot is found when

talking between the two microphones, one of them, or their

cables, is out of phase.

To change the phase of the one microphone, or cable, inter-

change the conductors that are wired to Pins No. 2 and No. 3

of the Cannon connector. Test all the microphones and cables

this way to insure that they are all “in phase” with each other.

Additional Inputs Using a Mixer:

If additional microphone inputs are required, a microphone

mixer (such as a Shure M68 type) or a second Vocal Master

Console may be used.

When using a microphone mixer for the additional inputs,

connect the mixer High Impedance Mic. Output to one of the

Input jacks on the VA300 Console. The individual input

control on the channel, bass, treble, volume, and reverb,

provide master control over the mixer inputs. See Figure 5.

Figure 5

When reverb and external echo are not required, the mixer

may be connected to the Echo “To Output” jack. With this

arrangement the mixer Aux. High Level Output is connected

to the Console Echo “To Output” jack. See Figure 6.

Figure 6

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Shure VA 300 Service Manual Page 10

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