Shure M71-C User Guide

222	HARTREY AVE., EVANSTON, l i . 60204 U.S.A.
AREACODE312/328.9000 .CA8LE:SHUREMICRO
MODEL M71C	DATA SHEET

	EASY-MOUNT	STEREO DYNETIC@
		PHONOGRAPH CARTRIDGE

SPECIFICATIONS

M71 AND M73 CARTRIDGE SERIES

N71 AND N73 STYLI SERIES

Model	Diamond Stylus
Number	Replacement	5 cm/sec.)
		~~-

	Side Contact Radius:
	.0004" (.010 mm)
	Frontal Radius :
	.0007" (.018 mm)
M71-6	NB71-6 Radius:
I/	,0006" (.OX mm)
M71C	NC71 Radius :
	,0006'' (.OX mm)

/	6.2 ~nillivolts1	Beige 1	l?b	to	3
I	I	I
	9.0 milli.io1ts	Blue	3	to	.5

-

*The N75-3 stylus may be used to reproduce the standard 78 rpm records. In this case, the amplifler should be set to "Monaural" or "A+B."

TRACKABI L I T Y :

M71EB a t a stylus force of 1% grams 400 Hz. - 14.3 cm/sec.

M71-6 a t a stylus force of 1% grams 400 Hz. - 14.3 cm/sec.

M71C a t a stylus force of 3 grams 400 Hz. - 14.3 cm/sec.

M73G a t a stylus force of 1gram 400 Hz. - 14.3 cm/sec.

Higher stylus forces within specified range improve trackability.

FREQUENCY RESPONSE: From 20 to 20,000 Hz.

CHANNEL SEPARATION: More than 20 d b a t 1,000 Hz.

RECOMMENDED LOAD IMPEDANCE: 47,000 ohms per channel

INDUCTANCE: 720 millihenries

D.C. RESISTANCE: 630 ohms.

MOUNTING: Standard '/z" (12.7 mm) mounting center using new "Easy-Mount" snap-in bracket.

W E I G H T : 5 grams

T E R M INALS: 4 terminals

GENERAL: The M71 and M73 Series of Dynetic phonograph cartridges has been developed for use with all high fidelity amplifiers having magnetic and constant velocity inputs.

MOUNTING: The cartridge bracket has standard 1/2" mounting centers. Hardware is provided for mounting purposes. (The brass

screws have British threads.)

1.Remove stylus guard and stylus from cartridge. (See paragraph on stylus replacement.)

-.

2.Remove cartridge from "Easy-Mount" snap-in bracket. (See (Figure 1)

3.Start mounting screws into tone arm head or plug-in shell.

4.Slip "Easy-Mount" bracket under heads of mounting screws and tighten screws securely.

5.Connect leads to phono-$artridge. Note color code for proper

connection to termlnal L,:' "R," "LG" and "RG" a s in- dicated-...-~in tone-arm instruct~onmanual.

6.Insert cartridge into "Easy-Mount" snap-in bracket. (See Figure 1)

~ BSHIELD~ ~ OFl ;CARTRIDGE~ ~ ~ ~MUST~ ; BFE PLACED~ : : I ; : E + p ~ ~ ~ ~ ~

\OARTRIDQE BUMP IN HOLE OF BRACKET. 7

\--LIFT HERE WITH T H u w N A l L FOR REMOVAL OF BRACKET.

CARTRIDGE AND BRACKET ASSEMBLY

FIGURE I

7. The top of the "Easy-Mount" bracket should be ,flu=\ aga!nSi the top of the tone arm head for proper playing position, unless other mounting instructions are s u p p l ~ e dby the record changer/tone arm manufacturer

8. Reinsert stylus.

SHURE-SME MOUNTING INSTRUCTIONS: TO mount the cartridge in the Shure-SME Precision Pickup Arm, Model 3009 and 3012, refer to the paragraphs on Cartridge Installation and Balancing In the Instruction Manual supplied with the pickup arms.

OPERATION: Recommended needle forces for optimum results are listed under "Speciflcations." Forces greater than the indicated "maximum" should not be used.

CONNECTIONS

4-LEAD STSREO CONNECTION: Connect "hot" lead of right channel to terminal "R" and shield or ground lead of rlght channel to terminal "RG." Connect "hot" lead of left channel t o terininal L" and shield o r ground lead of left channel ,to "LG."

To prevent "ground loops" and hum, no common connectlon should be used a t cartridge terminals.

MONAURAL CONNECTION: For slngle channel reproduction of Monaural or Stereo recordings, connect "hot" lead to both "R" and "L" terminals and connect ground o r shleld lead to both ground terminals marked "RG" and "LG."

Suggestions for Cleaning Your Stylus

To clean the stylus, use a camel's-hair brush (No. 2 size or smaller) dipped lightly in alcohol. The alcohol will remove any sludge depvsits which may have coated the stylus tip. The brush bristles should be trimmed to a length no longer than % inch. Always brush the stylus with a rorward movement from the rear (terminal end of the cartridge) tv the front. Never brush o r wipe the stylus from front to back or s ~ d toe side.

CAUTION: Do not make solder connections to cartridge terminals. Make all solder connections to terminal jacks provided before slipping them over the terminals.

TERMINAL DIAGRAM	STYLUS REPLACEMENT
FIGURE 2	FIGURE 3

EASY STYLUS REPLACEMENT

of the stylus mates with the cartridge case. Care must be taken not to allow the finger to slip off the molded housing of the stylus, resulting in damage to the stylus tip o r shank.

SPECIAL NOTE: Tltt* Ijynt.tic sty111.3: i ~ : i l ~ ~ ~Ul tS) lVy~i l l tllr.ie Cii1.- tl.~clgcs13 tllc lllust cr~rrcslC!,III~)UIICTI). I~~~.~ : i i l i l :the~in(8riglnal L I ~ ~ I ~ I~~I :Ii ~ll I( lIi ~Iof~: ~YULIId~~~v.~:i r~t ~ ~ t d xltc~ , ct~lla111l ~ a tally replacement stylus you. buy bears the foilowing certification on the package: "This Stereo Dynetic stylus is precision manufactured by Shure Brothers, Inc."

AVOID INFERIOR IhTITATIONS. THEY WILL SERIOUSLY DEGRADE T H E PERFORMANCE O F YOUR CARTRIDGE ALL GENUINE "DYNETIC" STYLI ARE MANUFACTURED BY SHURE BROTHERS INC.

LABORATORY TEST FINDINGS: (Note: The following stylus test findines of the Shure N3D stvlus a r e a n e x a m ~ l eof the close

9 ~ r n r i l sto trark a record with	a low comwiiance stvlus.'and 2
6:6db pcak 'io a drop of 7.5dlr.	Separation varied from "good"

(27db) to,"poorM (16.5db), a t 1 kc: These figures reveal ,that there is very l ~ t t l econsistency in pertormance character~stlcs of the inlitation Dynetic Styli.

I n each of the categories shown above the results ranged from good to poor. As a matter of tact, only 10% of the samples met the Shnre periorni:lnce standards for the Shure N3D Stereo Dynetic Stylr~s .I n addition to our test findings, our Service Department ~,ecordsshow that an Increasing number of Dynetic Phono Cartridges are being returned because of poor performance-and our esarninntion has disclosed tnat most of these returned cartridges arc using imitation Dynetic Styli.

CONCLUSION: Obviously. if any imitation Dynetic Stylus is used. we cannot g l t a r ~ n t e e that the performance of Shure Dynetic

cartridges will meet the publijhed Shure speciflcations. Accept no substitute.

GUARANTEE: This S ~ L I I Yp~,oduct'is guaranteed in normal use

to be free fr.oni electi .i(~;~land rliechariical

defects for

a

pt3riod of

onc year, froni ttic clatl' of pu~. chase. Plcasc retain

proof

of

purch:rse

dntt,. Tills

gri;rt.antee

in(:ludes

all

parts

and

labor.

This guarantc(' dor.s nut int,lu(l<.stylirs wear.

SHIPPING

INSTRUCTIONS:

Carefnlly

repark

the

unit

and

t.eturn

it

pt.i,~mitit o

ti-i(. f:rt,to~y. I f oulsidt,

the

1Jnitt.d

Statt's,

return

the u n ~ to your dealer or, autlio~~izedShur.c Ser.vice Center

for r'5patr.

Tiit, unit will bc ~ , e t u r n t dto you prepaid.

PATENT NOTICE: C:~rt~,idgeand stylus manufactured under one or more of the following U. S. Patents 3,055,988, 3,077,521, 3,077,522, and 3,463,889.

Copvright 1969 Sliul'e GIotliers Inc.	Printed in U.S.A.
27A565 (KK)