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CODED
TERMINAL
MODEL 407A
MODEL
4078
INTERNAL CONNECTIONS
FIGURE 2
tubing over the switchblade or with a piece of
insulating tape.
5. Place the microphone switch button in the normal
position on the case-front. Place the case-back on
the case-front and firmly press cases together.
Fasten the case-back and case-front with the
No. 6 Phillips self-threading screws previously
removed.
The microphone circuit of the Model 4078 is normal-
ly open when the microphone switch button is in nor-
mal position. The microphone switch of the 4078 may
be rewired to have a normally shorted microphone
circuit. To modify the Model 407B for a normally short-
ed microphone circuit, proceed as follows:
1. Remove the three No. 6 Phillips self-threading
screws from the back of the microphone case.
2. Separate the case front and back and remove the
microphone switch button.
3. Unsolder or clip the WHITE cable lead from the
upper switch solder lug. (See Figures 2 and 3)
4. Solder the WHITE cable lead to the lower terminal
lug, the one with the YELLOW lead going to the
microphone cartridge. (See Figures 2 and 3)
5.
Place the microphone switch button in the normal
position on the case front. Place the case-back on
the case-front and firmly press the cases together.
Fasten the case-back to the case-front with the
Phillips self-threading screws previously removed.
OPERATION
The Models 407A and 4078 will operate satisfactorily
under all ordinary conditions of humidity, heat, and
cold. Dropping the microphones or other severe me-
chanical shocks should be avoided.
U P P E R LUG
L O W E R LUG
F
REAR VIEW OF CHASSIS
(CASE REMOVED)
FIGURE
3
SPECIFICATIONS
Frequency Response
300 to 4,000 Hz (see Figure 4)
=
. , o
1
o
5
- 1 0
lpoo
F R E O U W I*
*Lmz
TYPICAL FREQUENCY RESPONSE
FIGURE 4
Output Level (at 1,000 Hz)
407A
4078
Open Circuit Voltage*
. . . . .
-13.5 dB
-33.0 dB
(210 mV)
(22 mV)
Power Level * *
. . . . . . . . . . . .
-52.0 dB
*O dB = 1 volt per 100 microbars
* * 0 dB
=
1 milliwatt per 10 microbars
Impedance
407A-Microphone
impedance is "High".
407B-Microphone
rating impedance is 150 ohms
(200 ohms actual).
Load lmpedance Range
Minimum
Recommended
407A
. . . . . . . . . . .
.15 kilohms
100 kilohms
407B
. . . . . . . . . . . .
200 ohms
1,000 ohms
Cable
1.8m (6 ft), attached, coiled cable
407A-3-conductor,
1-conductor shielded
407B-4-conductor,
2-conductor shielded
Case
Two-tone light gray and charcoal ARMO-DUR@
Dimensions
See Figure 5
A k
~ M M (11161N)
(2-5/81Nl
2 4 M M (3/32 IN1
OVERALL DIMENSIONS
FIGURE 5
Net Weight
312 grams (1 1 oz)
Packaged Weight
510 grams (1 Ib, 2 oz)
FURNISHED ACCESSORY
Mounting Bracket
. . . . . . . . . . . . . . . . . . . . . . . . .
RK6MB
REPLACEMENT PARTS
407A
4078
. . . . . . . . . . . . . . . . . . .
Cartridge
.99AN556
99AL556
. . . . . . . . . . . . . . . . . . . . . .
Cable
.70A3088
70A4107
. . . . . . . . . . . . . . . . . . . . . .
Switch
.90A3507
90A3507
GUARANTEE
This Shure product is guaranteed in normal use to
be free from electrical and mechanical defects for a
period of one year from date of purchase. Please
retain proof of purchase date. This guarantee includes
all parts and labor. This guarantee is in lieu of any
and all other guarantees or warranties, express or
implied, and there shall be no recovery for any con-
sequential or incidental damages.
SHIPPING INSTRUCTIONS
Carefully repack the unit and return it prepaid to:
Shure Brothers Incorporated
Attention:
Service Department
1501 West Shure Drive
Arlington Heights, Illinois 60004
If outside the United States, return the unit to your
dealer or Authorized Shure Service Center for repair.
The unit will be returned to you prepaid.
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