Suggestions . for Pro essiona

Master Recording

ALL. D RE ORD 1041 N. LOS PALMASAVE., HOLLYWOOD38,CAlIF.·H09·5107

Manufacturing (0.

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619 WEST 54th STREET, NEW YORK 19, N. Y.. JUdson 2·3791

SHIPMENT OF MASTER RECORDINGS

This demands SPECIAL care. They musr arrive ar rhe plant free of dirr, dusr or grir. If possible, use a special meral, wooden or plasric conrainer (design on requesr) wirh a polished (never rhreaded) center srud. Use 2-inch semi-sofr separarors on rhe srud ro keep masrers aparr. Always place rop masrer face down. Special containers will be rerurned ro you promprJy by rhe planr.

DO NOT PUT MASTERS IN ENVELOPES

If you can, seal rhe edges of containers to keep our dusr and moisrure. If such .. container is nor available and you have more than one master ro ship, you can use rhe following method of packaging:

1. Make sllre the masters are absolurely free of surface dirt and grir.

2. If you have any small 1 Y2" paper centers (used as separators in shipments of process ma'Ster discs from rhe manufacturer) place one ar the cenrer between each twO masters, and place the masters face to face. (If paper circles are not available use a folded piece of ordinary bond paper approxi­mately one inch square.)

3. To prevent the masters from slipping against each other, "Scorch" rape over the edge of the stack at

90 0

intervals. Pack in corrugated carron or wooden box.

10" - 12" - 16" MASTER RECORDING S PECIFICA nONS FOR TRANSCRIPTIONS 33V3 RPM

DIAMETER OF RECORDED LINES SIZE OF FINISHED PRESSING INSIDE OUTSIDE

10" NOMINAL 7.50" MINIMUM 9.50" ± .02" 12" NOMINAL 7.50" MINIMUM 11.50" ± .02" 16" NOMINAL 7.50" MINIMUM 15.50" ± y,,"

STYLUS PITCH 87

0

Angle (pills or minus 3") with .001 ro .0015 Any desirable, standard practice 112 -136 lines per inch. point Radius (use sapphires only).

ECCENTRIC TERMINAL GROOVE WIDTH Terminate recording with three or four blank grooves.

.0045" ro .005" . Lift clltter and move roward center approximately Va" .

LEAD-IN GROOVE

Not necessary on 33 1/; transcriptions unless specific

Engage feed screw and lower cutter. Cut approximately 20 blank grooves-then terminate. (Th is band of blank grooves for pressing purposes. These are referred to as

time cueing is required. "wiper grooves".)

10" and 12" MASTER SPECIFICAnONS FOR MICROGROOVE (Long Playing)

33V3 RPM

DIAMETER OF RECORDED LINES SIZE OF FINISHED PRESSING INSIDE OUTSIDE

10" NOMINAL 4.75" MINIMUM 9.50" ± .02" 12" NOMINAL 4.75" MINIMUM 11.50" ± .02"

STYLUS grooves and markings ourside 1O.~75" or 12. 375". Cut

87° Angle (plus or minus 3 0 ) with point Radius of minimum of one silent groove before modulation.

.00025" maximum. (Use sapphire only.) PITCH GROOVE WIDTH Any desirable depending upon the equipment limita­

.0027" to .003". tions and time desired up to 300 lines per inch .

LEAD-IN GROOVE ECCENTRIC TERMINAL

(Essential for records 10 be played on automatic challgers) Diameter of terminating groove should be 4-7 / 16" Start outside the 10" diameter (or 12" for 12" rec­ for both 10" and 12" records.

ords). Pitch should be six to eight grooves per inch. Test Eccentric runout relative to center hole-.250" ± .015".

10" and 12" MASTER RECORDING SPECIFICATIONS FOR 78 RPM PHONOGRAPH RECORDS 78 RPM

DIAMETER OF RECORDED LINES SIZE OF FINISHED PRESSING INSIDE OUTSIDE

10" NOMINAL 3.75" MINIMUM 9.50" ± .02"

12" NOMINAL 3.75" MINIMUM 11.50" ± .02"

SUGGESTIONS FOR RECORDING MASTERS TO

DEFINITION OF TERMS FULL PROTECTION (Three Step Processing)

To be used where more than a limited number of pressings will be required, or future production is antici­pated. Includes mas ter, mother, stamper and test pressing. Allied furnishes additional stampers as needed for its product ion, at no addi tional cost to client.

CONVERTED MASTER (One Step Processing) To be used only WHERE A LIMITED QUANTITY

of pressings wi ll be needed and where future production is not ~ nticipated. Platt is expendable and if it needs replacement it will be at client's expense.

TEST PRESSING An ac tual pressing made from finished stampers for

custOmer's acceptance and approval.

FULL PROTECTION (3 Step Processing)

ORIGINAL ACETATE MASTER-(Positive) An a luminum base, lacquer-coated disc. Sound modu­

lations are inscribed on its surface by the recording apparatus. This is silvered at processing plant.

MASTER MATRIX-(Negative) The copper master is made by electro-forming ir from

the origina l silvered ace tate. It is negative with ridges instead of grooves. Serves as protection.

MOTHER MATRIX- ( Positive) The copper mother is made by electro-forming it from

the master. It is an exact duplicate of the original with grooves and serves as fu ture prOtection.

ST AM PER- ( Negative) The stamper is the production plate, chrome plated for

hardness and durability and used to press the finished pressings. It is expendable. However, additional stampers can be made from the mOther with no loss of quality .

FINISHED PRESSING- ( Positive ) Can be pressed in severa l types of material ; vinyli te,

shell ac , or semi-Rex. Production ava ilable on 7" -1 0" -12"­16" sizes and any speed desired .

MASTER CONVERSION (1 Step Processing)

CONVERTED MASTER-(Negative ) Converted masters (one step processing) are made by

chrome plating the master; it then becomes a production stamper. Tbis conversioll is expendable and is limited ill life.

INTRODUCTION Here are suggestions to aid you in recording masters

to be used in subsequent processing and pressing. MORE THAN ORDINARY CAUTION must be exercised. If the original is nOt cu t to exaCt specifications, and certain tules closely followed, processing and press ing will be difficult or impossible.

DISC SIZES Oversized processi ng master discs must be used for the

master recording. These are available in sizes of 12",

BE USED FOR PROCESSING AND PRESSING 13];4" and 1 7J~", to be used for 10", 12" and 16" record ings respectively. M asters recorded on undersize instantaneous discs cannOt be processed.

CHECKING THE RECORDING CUT It is very important that sharp cu ning styl ii of proven

design be used for this work. A good sapphire cu ning stylus will cut the groove with a minimum of noise and the reproduction will be quiet over a working life of many plays. In checki ng the stylus (or cutting need le) make a test cut of several revolutions on the ollter portion of the masrer. Ca re shou ld be exercised in setting the sty lus so that it is securely fastened at the proper indi­ca ted angle with the disc as recommended by the sty lus manufacturer. A calibra ted microscope ( in mils) is essen ­tial , in professional work, to make sure that the depth and width of the CUt meets the standards specified in this brochure.

RECORDING LEVEL Never record at so Iowa level that the fina l pressings

will require tOO great ampli fica t ion, since only distortion and high surface noise can result from such over-ampl ifi­cation. Care, of course, must be taken nOt to exceed the limits o f your recording system. Recordings made espe­cially for use on juke boxes usually are recorded at a higher level than standa rd records.

HANDLING, MARKING AND SHIPPING OF PROCESSING MASTERS

DO NOT FINGERPRINT Remove blank disc carefully from wrapper and g ive

it a thorough visua l examination. Do not use the disc for th is type of work unless it appears to be perfect in every way.

Great care must be taken to insure that the side to be used for the master recording is not scratched or scuffed.

If the center hole of the recording blank is tOo small to slide easily over the center pin of the tllt ntable, ream it out carefully with a reamer or a pocket knife blade. Be sure that no residue or aluminum filings remain on disc. Never force disc over center pin - the resultant buckling may render the disc unfit for proper recording.

Masters for processing MUST be cut on only ONE SIDE of the blank. Disc lube or Other hardener must NOT be used.

DON'T PASTE LABELS Don't paste labels on the masters. They wi ll have to be

removed along with all traces of oil, dust, etc., from the surfaces. Identify your master by using a metal sc ribe to imprint a number inside, or outside the recorded portion on the disc. Identify your discs by number in your for­warding letter. This will give the plant proper informa ­tion.

PRINTING THE LABELS Labels should be made up to the following specifica­

tions by a printer familiar with the specific requirements : StOck - 80-Lb. book or heavier.

Ink - Thermosetting D iameter of center ho le :

Minimum .282 Maximum .285

to" and 12" MASTER RECORDING SPECIFICATIONS FOR 78 RPM PHONOGRAPH RECORDS

STYLUS (1~. 3 7S" for 12") . End Le~d-InGrooveat9.5" (or 11.5" 87" Angle ( plus or minus 3" ) with .001" w .OOlS" for 12 " records). Then silem groove for minimum of

poim Radius. (Use s~pphire only. ) one revolution ~nd maximum of four revolutions before modul ation. GROOVE WIDTH PITCH.005" [Q .0055" (Vinylite - Semi-Rigid) .

. 0065" [Q .001" ( Shellac pressings ) . Any desirable, standard practice 80-104 lines per inch .

LEAD-IN GROOVE ECCENTRIC TERMINAL (Essential/or records to be plc/yed on automatic changers) Diameter of terminaring groove should be 3.375" :!:

Start outside the ]0" diameter (or outside 12" for 12" .005" with groove width increased [Q a minimum of rec;ords ). Pitch should be six to eight grooves per inch. .0085", m~ximum .010". (Our processing plam has the Test grooves and marking outside the 10.375" di~me ter proper facilities w add to these termin~ls.)

7" MASTER RECORDING SPECIFICATIONS 45 RPM

DIAMETER OF RECORDED LINES SIZE OF FINISHED PRESSING · INSIDE OUTSIDE

6.875" ± .005" . 4.875" MINIMUM 6% " + 0" - J{,"

STYLUS ment limitations. USlJaI practice 200 to 240 lines per inch. 85 ' Angle (plus or minus 5·') with poim r~dius of ECCENTRIC TERMINAL

.00025 maximum . The present practice is w make the concentric termi­GROOVE WIDTH

nating groove .005" in width instead of maimaining.0030" + .0000"

sound groove width of .00)". Concentric groove termi­- .0005".

nates at 3?1s" + 0" - 1/ 32" diameter. LEAD-IN GROOVE

NOTE: To have same dimensions as modulation TAPE grooves. Lead-in is essemial for playing on auwmaric We can arrange for complete dubbing facilities for all changers. tape recording speeds on either paper base or plastic PITCH base tape. Please indicate, on the ree.1 box, speed at which

Any desirable depending upon time desired and equip- tape is cut, plus toral running time and ririe.

Maximum Time Versus Lines/inch and Minimum Diameter

Lines/ inch

300 280 240 200 160

33V3 RPM

Time/inch (radius)

9:00 8:24 7:13 6:00 4:48

Micro·groove (Long Play) 10" 12" 16"

(Min. dia. 4.750") (Min. dia. 7.500") 25:48 30:18 36:00 24:05 28:17 33:36 20:38 24:14 28:52 17:12 20:12 24:00 13:46 16:09 19:12

136 128 120 112

33 1/3

RPM 4:05 3:50 3:38 3:22

Transcriptions 10" 12" 16"

(Minimum dia. 7.500") 4:05 8:10 16:20 3:50 7:40 15:20 3:38 7:16 14:32 3:22 6:44 13:28

104 96 88 80

78 RPM

1:20 1 :14 1 :07 1 :02

Phonograph Records 10" 12"

(Min. dia. 3.750") 3:51 5:54 3:38 4:42 3:16 4:19 2:57 3:55

300 280 240 200 160

45 RPM

Recorded Radius less than 1 inch

45 RPM Records 7"

(Min. dia. 4.875") 5:42 5:19 4:34 3:48 3:02

N R Rotational speed, in RPMTime/inch = If"

N Lines per inch 0.0. -1.0. 0.0. Outside recording diameter, in inches

Total Time = --211- x N 1.0. Inside recording diameter, in inches