RCA_MI-4916-A - Preservation Sound

1channel into the fecording setup, an arrangementsimilar to figure 5A may be used, except that anisolation transformer of correct impedance must besubstituted for the bridging transformer, and the600.ohm pad must have a 25-db loss instead of 15-db loss. The setup shown in figure 5C may be usedwhen recordings are to be made directly from the.studio microphones. Make sure that the resistors'marked X and Y are included at the positioosshown, since these prevent resonance between therecording filter and the windings of the transforn.ers, It is irnportant that the output.volume level ofthe preampliier be kept down to approximately-30 dbm so that the first stage of the amplifier isnot ovedoaded on the peaks. This may require theinsertion of a 600-ohm pad similar to the one shownin figure 5A, immediately after the preamplifler.rVhen the pad is used make sure that the resistor Xis disconnected from the output of the preamplifierand connected after the pad as shown in figure 5A,ConnectionrConnect the incoming line to the 6lter terminalsmarked lN and C. Connect rhe outgoing line tothe terminals marked OUT and C. Connect agrounding wire to the terminal under the mountingnut at one end of the terminal-board assembly.Refer to fgures 1,2 ac'd. 6.Use shielded twisted pair for input and outputconnections to the MI-4916-A Recording Filter. Donot run the leads laced in with, or adiacent to, highlevelaudio or a.c leads.Conversion of Ml-4915 to M1-4916-ATo convert the MI.49l6 to have the same characteristicsas the MI-4916-A, shunt the resistor R.2used on the former unit with a 10,000-ohm, lz-wattresistor.Replacement Pa:tsThb following parts list is included to provideidentification when ordering replacement parts.Order from RCA Replacement Parts Dep$rrneat,Catnden, Neut Jersey, givitg the Stock Numbet andDescription of the parts wanted. Replacement partssupplied may be slightly different in form or sizefrom the original parts but will be completely interchangeablewith them.LIST OF PARTSSymbol Detcilr;ort Slock No,c-1,.2c-3c-4LIL.2R-1R-2Capacitor, 0.01 fnf, 1000 vCapacitor, 0.05 mf, 400 vCapacitor- 0.1 mf, 400 vReactori 10 hyReactor, 1.3 hyResistor, 4,700 ohms, 1/z wattResistor, 1,900 ohms, lZ watt70652706157061743691436923049430694It,-- l;;lE:']I HEIL li l"lHIt l L_-...]c-41 I I-tt@@@@ t2t2M- 140790Figure 6-Pofts Locotion DiagrcmRRDIO CORPORRTIONRCR VICTOB DIVISIONOFCRRM€RICRrnD€n, n. t.PRTNTTD IN U. S. A.427