Shure 777, 777A, 777S, 777SA User Guide

When used near a radio transmitter, use the minimum length of cable consistent with placement requirements. Careful grounding of the cable shield is advisable.

Connections: The Inner or "hot" conductor of the cable should be connected to the grid of the first tube in the amplifier across a load resistance of 5 megohms. Input resistance as low as 1 megohm may be used, if necessary, but higher values are recommended because of better low-frequency response obtained. The shield should be connected to the amplifier chassis or ground. The shield, chassis or amplifier ground should be securely grounded to a water pipe or similar ground to prevent shock hazard during operation of the amplifying system. The cable may be lengthened if desired; low capacity shielded microphone cable should be used for this purpose.

Important: Shure Microphone Cables are selected after exhaustive tests to insure superior performance in microphones because of low capacities, superior shielding properties and unusually long life under severe use.

Cables with plastic insulation should not be subjected to excessive soldering-iron hkat. Carefully clean and tin the conductors and the connections to which the conductors are to be soldered. The soldering operation can then be done with a minimum of heat, thereby avoiding any possibility of damage to the cable.

Guarantee: Each microphone is guaranteed to be free from electrical and mechanical defects for a period of one year from date of shipment from the factory, provided all instructions are complied with fully. In case of damage, return the microphone to the factory for repairs. Our guarantee is voided if the microphone case is opened.

License Notice: Shure patents issued or pending.

	FURNISHED ACCESSORIES
MODELS 777 and 7779
Stand	Adapter ..................................................................................................	65A102
Lavalier Assembly ..................................................................................................		A22L
MODELS 777A and 777SA
Swivel	Adapter ......................................................................................................	A25B
Desk	Stand ............................................................................................................	S38B
Lavalier Assembly ..................................................................................................		A22L

OPTIONAL ACCESSORIES

"Quick" Disconnect Isolation Adapter ......................................................................

A45

REPLACEMENT COMPONENTS

Cable and Plug Assembly	............................................................................................ C58
Crystal Cartridge ................................................................................................	1 8 6 A

SPECIFICATIONS

Frequency Response: 60 to 10,000 Hertz.

Polar Pattern : Omnidirectional.

Impedance: High (Recommended load impedance 1 to 5 megohms)

Voltage Sensitivity: 1.05 millivolt r.m.s. per microbar a t end of 7 foot (2.1 m ) cable across 1 to 5 megohms at 1,000 Hertz (this is equivalent to 59.5 d b below one volt per microbar). E.I.A. Microphone Rating Gm (Sensitivity) -162.0 db.

Cable: Detachable 7 foot (2.1 m) rubber-covered, single-conductor, shielded cable with Amphenol M C l F plug for attaching cable to microphone.

Stand Adapter Thread: %"-27

Dimensions: Length, overall (with adapter) 7 inches (177.8 mm) . Length, overall (microphone only) 4943 inches ( 111.1 mm) . Body Diameter 1 inch (25.4 mm) .

Finish: Satin Chrome.

Switch: Models 7773 and 777SA only. Built-in "ON-OFF" switch to control microphone circuit. Press-to-talk locking or non-locking action.

Weight: Net 6 ounces ( 170.1 g ) , Packaged	1 lb. (453.6 g ) .
Copyright 1953, Shure Brothers, Inc.
27A72 ( 10-67)	Printed in U.S.A.