Shure R7 User Guide

Ins8al9a+iew and Connec+ion Ilns+ruc9ioses for Model R7

Crysfail Microphone RepBacerarsenQ.(=ar+rislqe

SPECllAL INFORhWATlOkl

Hiqh Oufpu*: 50.0 d b below I volt per microbar a t end o f 7 foot (2. 1 m) cable.

~h~ abovefigure	shows the model R7	itsrubber	ringWhen.
installed intoa	microphone, this rubber	ring provides	isolation from ma-
chanical shocks and handling.

Model R7 may b e used as a replacement in the Shure Models 707A, 708A, 718A and similar microphones. Also, model R7 may be used as a roplacement in competitive models o f such size and shape as will receive the rubber mounting ring. The rubber mounting ring may be modifiod t o fit certain microphone cares by buffing, cutting, etc. t o desired size without impairing the performance of the cartridge.

Excellen+ Frequency WeSpornSe: 50 t e lo,oOO cycles per second.

Rising high frequency characteristic for maximum intelligibility.

Model R7 utilizes a Bimorph, Rochelle Salt crystal.

Model R7 crystal replacement cartridge is shipped pre-assembled into its rubber mounting ring t o facilitate installation.

Guarantee: Each replacement cartridge is guaranteed t o b e free from electrical and mechanical defects for a period o f one year from date o f shipment from factory, provided all instructions are complied with fully.

DO MOT EXPOSE 8 0 HIGH TEMPERATURE AND HUMBDIITY! DO NOT APPLY HIGH VOLTAGE!

This Shure cartridge is a Rochelle Salt crystal device and should be pro-

I n most	instances, a two-wire circuit	(single conductor shielded cable) is
used t o	connect the cartridge. The	inner or "hot" conductor	should	be
connected t o the terminal designated		"A" in illustration shown	above	and

the shield or ground conductor should be connected t o the terminal desig-

nated "B". Care	must be taken not t o	injure the crystal in the	cartridge
due t o applying	excessive heat t o the	terminals when soldering	the con-

necting leads. The cable leads should be cleaned and carefully tinned: then the soldering operation should b e performed rapidly with a hot soldering iron. Cool immediately after soldering with swab or cotton soaked in alcohol.

tected from temperatures above 125" F. (51.6" C) and from excessive humidity. Optimum results will be obtained if the crystal cartridge or microphone is stored in enclosures having a temperature around SO0 F. and a humidity of 50%. For replacement in microphones intended t o be used under conditions of high temperature and humidity, the Shure "Controlled

Reluctance" Model R5 replacement cartridge is recommended. A crystal unit may be seriously damaged if accidently connected t o loud speaker or power outlets carrying high voltage. Check your connections carefully.

27A50 (6-68)

Printed in U.S.A.