Shure 812 User Guide
FIGURE D. D I M E N S I O N A L D I A G R A M .
/+
1-1/2 R.
TYPICAL OPERATING DATA
Bias and |
i |
25 kc I |
33 LC |
40 kc |
D.C. |
||
Erase Freq. |
|||||||
|
|
|
---- |
||||
Recording |
|
.43 |
.43 |
.43 |
.43 |
||
Current (ma.) |
|
||||||
---- |
|||||||
|
|
||||||
Bias Current |
|
3O. |
3O. |
|
2.25 D.C. |
||
(ma.) |
(Rec. |
|
3.0 |
||||
Coil) |
|
---- |
|||||
|
|
|
|||||
Erase |
Current |
|
63 |
65 |
65 |
60 D.C. |
|
(ma.) |
(*I |
|
|||||
|
---- |
||||||
|
|
|
|||||
Erase (Volts) |
|
42 |
5 1 |
57 |
0.75 |
||
|
|
---- |
|||||
Erase (Watts) |
|
1 .OO |
1.30 |
1.65 |
.05 |
||
|
|
---- |
|||||
Impedance |
|
650 |
770 |
890 |
12 |
||
Erase Coil |
|
ohms |
ohms |
ohms |
ohms |
||
|
|
|
I |
|
|
|
|
(* ) Erase Current chosen for 40 d b erasure |
of 400 c.p.s. |
signal, re- |
|||||
corded with |
typical |
Recording |
and Bias Currents. |
|
|||
IMPEDANCE Recording & Playback coil,
Gap .001", 800 ohms a t I kc.
FIGURE C
INTERSTAGE COMPENSATING NETWORK
AMPLIFIER -
PB PLAYBACK
REC: RECORD
FIGUR E B. RESPONSE FREQUENCY CHARACTERISTIC .
FREQUENCY-CYCLES PER SECOND
Recording Medium : .004" Diameter Stainless Steel
W i r e , Nationa l Standard Company , Specification W555.
W i r e Speed 2 Feet Per Second.
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