KINESCOPE Electrostatic Focus Rectangular Type 18-3/8" x13-15/16"
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21DP4
KINESCOPE
Electrostatic Focus Rectangular Type 18-3/8" x13-15/16" Picture Size
Magnetic Deflection Metal-Shell Envelope Max. Shell Diagonal
Ion-Trap Frosted Filterglass Face Plate 22-5/8" Max. Length
TENTATIVE DATA
RCA-2IDP4 short, directly viewed, rectangular picture tube metal-shell type television receivers. picture size 18-3/8" 13-15/16" with slightly curved sides rounded corners.
Utilizing electrostatic focusing, features electron improved design provide good uniformity focus over entire picture area. Furthermore, focus maintained automatically with variation line voItage with adjustment picture brightness. Need alignment focusing coil focusing magnet eliminated therefore tube installai ustment optimum performance simplified. Because electron isdesigned that focusing electrode (grid No.4) takes very little current, voltage focusing electrode provided easily economically.
rectangular shape, which allows reproduction transmitted picture without waste screen area, permits cabinet having about cent less height than required round-face tube having same picture width. addition, chassis need depressed under face tube controls located desired beneath tube.
providing pictures having high brightness, 2IDP4hasa gh-ef ency, uorescent screen relatively flat, high-quality face made frosted Filterglass prevent specular reflection provide increased picture contrast. frosted Filterglass face plate incorporates neutral light-absorbing material which reduces ambient-Iight reflections from phosphor reflections within face plate itself much higher ratio than reduces directly viewed light picture. result, improved picture contrast obtained. addition, frosting face diffuses reflections bright objects room which might otherwise objectionable.
Employing magnetic deflection, 21DP4 designed with funnel-to-neck section which facilitates centering yoke neck and, combination with well-centered beam inside neck, contributes good uniformity focus over entire picture area. diagonal deflection angle horizontal deflection angle
Other design features 21DP4 short overall length, lesser weight than that similar ail-glass type, ion-trap requiringonly asingl eId, external magnet.
DATA
General:
Heater, unipotential cathode:
voltage DC). volts
Current. ampere
copyright, 1951
Radio corporation America
TUBE DEPARTMENT
RADIO CORPORATION AMERICA, HARRISON, JERSEY
21DP4-5-51 Photolithographed U.S.A.
Direct interelectrode capacitances:
Grid Other Electrodes.
Cathode other Electrodes.
Face plate (with about
light transmission). Frosted Filterglass
phosphor Type
Fluorescence White
Phosphorescence. White
persistence. Short
Focusing Method.Electrostatic
Deflection Method.Magnetic
Deflection Angles (Approx.):
Ion-Trap Requires External, single-Field Magnet
Maximum overall Length 22-5/8"
Greatest Diagonal Tube 20-3/4" 1/4"
Greatest width Tube Lip. 19-23/32" 1/8"
Greatest Height Tube 15-5/16" 1/8"
screen Size.I8-3/8" 13-15/I6"
tor* Termi nal.Metal-Shell
Base Small-Shell Ouodecal 6-Pin (JETEC NO.B6-63) Mounting position.Any
Maxiaum Ratings, Design-Center 7alv.es:
ULTOR* VOLTAGE. 18000 max. volts
GRID-NO.4 VOLTAGE. 5000 max. volts
GRID-NO.2 VOLTAGE. max. volts
GRID-NO.1 VOLTAGE:
Negative bias value. max. volts
Positive bias value. max. volts
Positive peak value.2 max. volts
PEAK HEATER-CATHODE VOLTAGE: Heater negative with
respect cathode: During equipment warm-up period
exceeding seconds. max. volts After equipment warm-up period max. volts Heater positive with
respect cathode. max. volts
Equipment Design Ranges:
ultor voltage (Su) between lifOOO* 18000 volts grid-go.3 voltage ffcg-' between volts
Grid-no.it voltage
Ultor current ^amp. 26.7* volts Grid-No.1 voltage sual
undeflected Focused spot. volts
Grid-No.4 current.-15 to+25 Mamp
Grid-No.2 current.-15 Mamp
Field strength Single-l
Field on-T ^Mag Vu^o" 9aUSS6S
Field strength Adjustable centering Magnet gausses
Exanples Design Ranges:
ultor voltage U000 16000 volts
grid-lo.2 voltage volts
Grid-No.4 voltage ultor current Mamp 2750 to3740 3150 4270 volts Grid-No.1 voltage visual Extinet undeflected Focused spot. volts ion-Trap Magnet
(Rated Strength). gausses
Maxiaua Circuit Values:
Grid-No.l-circuit Resistance max. megohms
21DP4, grid no.5, which ultor function, grid No.3, collector connected together within tube conveniently referred collectively "ultor". "ultor* cathode-ray tube electrode, electrode combination with more additional electrodes connected within tube which appl highest voltage accelerating electrons beam prior deflection.
Bri11iance definition decrease with decreasing ultor voltage, general, ultor voltage should less than 14000 volts.
specimen ion-trap magnet similar JETEC ion-Trap Magnet no.Ill located optimum position rotated give maximum brightness, ion-trap magnet current approximately 11iamperes when ultor voltage 14000 volts.
OPERATING CONSIDERATIONS
maximum ratings tabulated data 2IDP4 working design-center maximums established according standard design-center system rating electron tubes. Tubes rated will give satisfactory performance equipment designed that these maximum ratings will exceeded when equipment operated from power-line supplies whose normal voltage including normal variations falls within cent Iine-center voltage value volts.
X-Rny Warning. When operated ultor voltages kilovolts, 2IDP4 does produce harmful x-ray radiation. However, because rating tube permits operation voltages high 19.8 kilovolts (absolute value), x-ray radiation needed protect against possible injury from prolonged exposure close range whenever operating conditions involve voltages excess kilovolts.
Corona Considerations. Adequate spacing between 2IDP4 grounded element receiver, between metal shell grounded element, should provided preclude possibility corona. Such spacing should less than 1-1/2 Inches air.
Insulating Material Mask. glass face plate does have especially high electrical resistance. essential, therefore, that mask material bearing face plate adequately insulated withstand maximum applied ultor voltage. Unless this precaution observed, picture distortion experienced.
Tube Handling. Care should taken prevent bumping striking 2IDP4. Rough treatment damage face-plate seal. This seal most vulnerable along sides metal shell, particularly blow nside lip.
caution notice incorporating information shown page affixed metal shell each 2IDP4. recommended that similar notice prominently displayed equipment using 21DP4 included equipment serv
allow metal shell 21DP4 come contact with magnet thus become permanently magnetized. magnetized shell produces localized distortion picture edges.
Care Tube Face. frosted Filterglass face 21DP4 more easily scratched abraded than unfrosted face must, therefore, handled more carefully. Finger marks removed from face with detergent, such Dreft, with grease solvent, such carbon tetrachloride.
Shatter-Proof Cover Over Tube Face. recommended that receivers designed with shatter-proof, clear glass plastic cover over face 21DP4 protect from being
CAUTION-HIGH VOLTAGE
This METAL SHELL operates HIGH VOLTAGE. TOUCH while operation. GROUND SHELL before touching after power off.
X-RAY WARNING
Shielding cathode-ray tubes x-ray radiation needed protect against possible danger personal injury from prolonged exposure close range when they operated above kilovolts.
Always Handle this tube NECK-S SHELL SHELL only
Never Handle
this tube that part having
INSULATING
COATING
Finger prints dust insulating coating cause electrical breakdown during humid weather.
HANDLE WITH CARE
Breakage this tube, which contains high vacuum, result injury from flying glass. strike scratch tube. Never subject more than moderate pressure when installing removing from equipment.
provide cushion between them also prevent abrasion insulating coating funnel resultant arcing from metal shell hood. hood should designed that placed close possible Reference Line (see Outline Drawing) without interfering with yoke order reduce amount insulation required between hood funnel. also essential that electrical contact made from hood funnel because such contact will decrease Iength leakage path across insulating coating glass funnel. Furthermore, hood should exert undue pressure deflecting yoke.
yoke should held firmly against glass funnel (see proper location under Deflecting Yoke), thrust should absorbed insulating cushion. hood should specially braced prevent lateral longitudinal motion caused buckling chassis which occur during transportation receiver. simple brace from edge chassis usually provides extra stiffness required; small foot placed directly under yoke sufficient. Unless precaution against thrust yoke observed, tube yoke damaged during transportation receiver.
deflecting yoke should have effective length more than 1-11/16 inches designed that effective center deflec-
struck ident rotect agai pass damage resulting from tube implosion under some abnormal condition.
Sup-port 2IDP4, which operated position, should provided large suitable supporting insulators corners tube, defIecting-yoke mounting neck. Support areas indicated Outline Drawing. Other portions periphery should left free avoid possibility fracturing face plate-to-lip seal (see Tube Handling).
ng-y mount somet mounting hood, should provide adjustment alignment yoke neck should also provide sufficient pressure hold yoke firmly against glass funnel. Some good insulating material, such Neoprene, required between hood glass funnel only
0.500
REFERENCE LINE GAUGE
1.500 -0000
92C3-739I
NOTE- INNER SURFACE YOKE MUST EXTEND INTO SHADED REGION
Fig. Reference-Line Gauge (JETEC with Supplementary Information Recommended Inside Contour Yoke Provide Proper Location Yoke Heck-Funnel Section.
tion beam about 1.15 inches from Reference Line (see Outline Drawing). This position takes into account center-
magnet provides some leeway effect beam without causing beam strike neck when deflection sufficient reach edge screen.
yoke should have inside contour which conforms general dimensions shape shown Fig.I. noted that inner surface yoke adjacent glass funnel should come closer funnel than indicated line Fig.I adequate insulation maintained across glass funnel between point yoke contact metaI
Focusing beam accomplished adjustment voltage applied grid No.4. Because this electrode takes very current, focusing voltage easily provided. method used must take into account grid-No.4 leakage current shown tabulated data. When high-voltage supply puIse-operated, Iimited-energy type commonly used, focusing voltage obtained means simple rectifier system connected suitable horizontaI-defIection-output high-voltage transformer. Such arrangement produces negligible drop output voltage high-voltage supply.
ion-trap magnet, reauiredto recenter beam ructure, shouldbeof single-field type. should provide uniform field across transverse section tube neck produce round, focused spot. Direction field ion-trap magnet should such that north pole adjacent vacant position No.8 south pole No.2.
operate properly with electron IDP4, ion-trap magnet should have afield rength such that optimum position magnet inthe region grid No.2 (see Fig.2), with departure being direction base rather than toward metal shell. optimum position should result properly centered pattern having full brightness shadowing edges.
ion-trap magnet much stronger than indicated tabulated data tends
raise focusing voltage beyond indicated maximum value. Because this fact absence shunting effect field focusing coil magnet, will found that optimum strength ion-trap magnetic field will somewhat less than required comparable magnetic-focus tube.
strength ion-trap magnet other ultor voltages than those indicated will proportional square root ultor voltage.
Centering pattern accomplished small, adjustable centering magnet located near base deflecting yoke. This magnet should provide uniform field over transverse section electron beam order prevent formation elliptically shaped spot with consequent defocusing screen. field considered uniform when field lines straight instead curved. position centering magnet tube neck must within distance 3-1/4 inches from Reference Line (see Outline Drawing). When magnet positioned limiting distance, field deflecting yoke relatively weak will have little demagnetizing effect. When placed closer deflecting yoke, magnet must made material capable withstanding stronger field without demagnetization. magnet placed from deflecting yoke, appreciable deflection defocusing neck shadow will result. component deflecting currents should filtered deflecting yoke order minimize amount centering adjustment needed.
REFERENCES
"Medical X-ray Protection Million rolts",
National Bureau standards Handbook HUI.
"Safety Code Industrial X-rays", American
Standards Association, Code Z54.1-19U6.
GRID
APPROX
92CS-7603
Fig.2 Location Grid Ho.a Tube Neck.
Devices arrangements shown described herein patents others. information contained herein furnished without responsibility without prejudice RCA's patent rights.
VOLTS "ULTOR COLLECTOR) VOLTS 16000
GRID VOLTS ADJUSTED GIVE FOCUS AVERAGE RASTER BRIGHTNESS -GRID BIASED CUTOFF UN-DEFLECTED FOCUSED SPOT
VIDEO SIGNAL
;:E^=6.3 VOLTS ULTOR
COLLECTOR) VOLTS 14000 18000 GRID BIASED CUTOFF
UNDEFLECTED FOCUSED SPOT
VIDEO SIGNAL VOLTS FROM CUTOFF
92CM -7650
Average Characteristics Type S1DP4-
Fig.4 Average Grid-Drive Characteristics Type 21DP4-
DIMENSIONAL OUTLINE
NOTE WITH TUBE HECK INSERTED THROUGH FLARED REFERENCE-LINE GAUGE (JETEC NO.110) WITH TUBE SEATED GAUGE, REFERENCE LINE DETERMINED INTERSECTION PLANE GAUGE WITH GLASS FUNNEL.
NOTE SOCKET THIS BASE SHOULD RIGIDLY MOUNTED! SHOULD HAVE FLEXIBLE LEADS ALLOWED MOVE FREELY. BOTTOM CIRCUMFERENCE BASE SHELL WILL FALL WITHIN CIRCLE CONCENTRIC WITH METAL-SHELL AXIS HAVING DIAMETER
NOTE METAL SHELL GLASS FACE OPERATE HIGH VOLTAGE. MATERIAL CONTACT WITH SHELL FACE MUST INSULATED WITHSTAND MAXIMUM APPLIED ULTOR VOLTAGE.
NOTE PLANE THROUGH TUBE AXIS NO.6 VARY FROM HORIZONTAL AXIS GLASS FACE ANGULAR TOLERANCE (MEASURED ABOUT TUBE AXIS)
NOTE SUPPORT TUBE REGION ONLY CORNERS WITHIN THIS SPACE.
SOCKET CONNECTIONS Bottom
HEATER GRID no.l GRID NO.4 GRID no.2 CATHODE HEATER METAL-SHELL LIP: GRID no.3, GRID no.5, COLLECTOR
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