CK7571 RAYTHEON | Alldatasheet

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The CK7571/QK685 is a high resolution electrical output Recording as it ; poe Storage Tube capable of repeating information stored for many hours up ES | to 20,000 times without serious deterioration of signal strength or quality. ieee ake It requires magnetic deflection but it can be focused either magnetically ool bee or electro-statically, or using a combination of both. The properties of Bree. integration ability, dynamic range, storage duration and speed of opera- = «2 tion in the various modes are approximately equivalent quantitatively oS ease with those found in the prototype tube CK6835/QK464A. be + 2 GENERAL CHARACTERISTICS | 7 Resolution (Magnetic Focus) see 1000 Lines Minimum Cee ek lle Pro) Resolution (Electrostatic Focus). . . ~. 700Lines Nominal wes 3 | | Focusing - - « « « «+ « ~ Electrostatic or _ se. Magnetic os oe RECORDING STORAGE MECHANICAL CHARACTERISTICS TUBE Storage Screen Diameter... «ss 2” Printed in USA V/1/59/1 Page 1 of 4

DETAILED ELECTRICAL INFORMATION CONDITIONS OF OPERATION When reading with a low beam current of about Application of the recording storage tube in- 1.0 uA at a television repetition rate and scan, sev- volves four operations, namely: prime, write, read eral thousand consecutive readings can be made and erase. Any form of scanning may be utilized without any appreciable deterioration of the for the above operations. These operations are stored signal. This indicates that a single spot performed in the following manner and sequence: ©lement can be read continuously for approxi- mately 5 milliseconds without significant fading Prime — Priming is accomplished by uniformly or reorientation of the charge. charging the storage surface. To The tube is capable of storage information for prime the storage screen reduce the . . eye many hours without appreciable change or de- screen voltage below the critical po- . . < . terioration and may be read up to 20,000 times tential (usually 90 V) and scan the ster the delay period and still yield satisfactor raster with 10 to 50 uA depending on results Y Ps ¥ Y priming speed desired. 7 Write — Set control grid bias at cutoff either RESOLVING POWER manually or automatically and apply The resolution of the storage tube at the 50% signal to be stored. Signal voltage caulation level is usuall f 1000 Ii = - ~ ly in excess o nes amplitude required will depend on cross the diameter and is obtainable when the the sweep speed employed and is wa ays Il dulated measured in terms of average cathe minimum current for writing a fully modulate ode current. signal is employed and the focus coil magnetic shell is designed to minimize astimagtism. Resolu- Read — Set grid bias to permit an unmodu- tion is also dependent on the orientation of the lated beam current of approximately focus coil with respect to the gun, and the sharp- 2 uA. If the storage screen voltage is ness of focus across the storage screen. Therefore, properly set, the stored signal will for applications requiring optimum resolution, dy- modulate the beam and an output —_— namic focusing is often desirable. can be taken from the signal elec- trode. FOCUS Erase — Erasing is performed by writing a Using a standard BM411 focus coil, approxi- DC signal into the tube, thus normal- —_—mately 19 MA of current will be required for de izing the storage element at full mod- magnetic focusing. If dc electrostatic focus is used, ulation level. The signal electrode the focus voltage will be approximately 400 volts. and storage screen voltages should For magnetic de focus and electrostatic dynamic be the same for this operation. A focus, it is recommended that the electrostatic beam current of 10 uA is normally focus electrode be set at 1000 volts de and that used. This operation can be elimi- the magnetic focus current be adjusted for opti- nated in many applications where mum spot size in the center of the storage screen only partial erasures are desired or (approximately 16 MA will be required). With where the time which can be allotted these static conditions, the dynamic waveform ap- priming is one second or more. plied to the electrostatic focus element will rise from the 1000 volts de value to approximately 1150 STORAGE ABILITY volts dc as the beam is scanned from the center The length of time a tube will retain the stored of the screen to the edge. (The rise will be slow information is a function of the operating condi- for the first half of this distance and then at an tions and varies inversely as the cathode current. increasing rate.) NNR creme niece tartar ate er pncompen ets: Teka oo Se Pg ctcigs Povo Riaians carci 3 asiine: Mie een ae

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ff. 2 cottector ELECTRICAL —— sronace (All Voltages Measured With Respect to Cathode) Niassnstanatgentann ___- DeceLeraTor Heater ee Heater Current . . : : . : O6A apy ee Maximum Ratings ey eee ee Anode Voltage (Al) . 5 . . . 5000 Vdc Grid #1 (control electrode) Voltage % / Positive Bias. : : . : 0Vde She Positive Peak Value . . . . +2Vde Focus Anode Voltage (A2). . . 5000 V lns#] . . 2 7 800 Vde | rd lens #2 2. . . . 500 Vde Decelerator Screen . . . 800 Vde — Al Storage Screen . . : . . 500 Vde Typical Operating Conditions L Cathode . 2. 2 1 we ov Ir SE Gl (Control Grid) Cutoff . . . . —30V TT SATHODE L1 (Collimating Lens) . . . . 750 V me L2 (Collimating Lens) . . . . 400 V - Anode (Al) . . . ee 3500 V Focus Anode (A2).. . - et ee Magnetic . . . . 3500 V Decelerator 9. 0. 0. eee 750 V \\ Py Collector . . . ew 750 V K (sai so \\ Qo Prime Read Erase Write ~ NM oe <x Storage Screen. . 20V 15V t 300 V LRA Cathode Current » Bpa Spa 50 pa * Rig? ae Signal Electrode . (FOCUS ANODE) Current (peak) . . 0.5 pa (\\\\ * This value must be determined experimentally depending on scan speeds. J A (ANODE) t Should be shorted to Decelerator Screen during Erase. N/1/59/1 Page 3 of 4

ee’ ED | RECORDING STORAGE TUBE 625 435, : { += O88 01a 3 PINS NOTES - i 1) LOCATION OF DEFLECTION YOKE AND THE GAP OF THE sr : FOCUSING COIL MUST BE WITHIN THIS SPACE ———) 2) SOCKET FOR THIS BASE SHOULO NOT BE_RIGIOLY ————) MOUNTED, IT SHOULD HAVE FLEXIBLE LEADS AND BE el ALLOWED’ TO MOVE FREELY BOTTOM CIRCUMFERENCE | £ y OF BASE SHELL WILL FALL WITHIN A CIRCLE CON- GG) Bae CENTRIC WITH CONE AXIS, ANO HAVING & DIAMETER i ow OF 2.000 y Ss 3) TOP PIN CONNECTIONS SHOULD HAVE FLEXIBLE LEADS | RN : 323 010 AND BE ALLOWED TO MOVE FREELY S-STORAGE SCREEN (BLACK DOT) eyes 4 C-COLLECTOR (RED DOT) ‘ Sane! iS) D- DECELERATOR (YELLOW 097) > 13250 ND 4) BI2-43 12 PIN BASE 12280 |e ee 5) LENS BUTTONS JETEC TYPE Ji-22 LENS #2 BUTTON | NEAR STORAGE ASSEMBLY | REFERENCE ne a TINE i sn ee BM-4I| FOCUS COIL | | ee | 3799 DNS t maa A #20 frewpre j 3500 ; fminiat ') RSGLASESWike S / ro00e i i r 1 | Se ccccny a is 13.725 as oe i 8250 rm | "2625 HH i 7250 f — | 1 50 Hii ed 137904 oot : 1625 | ioe | | Hi #1-SI RESISTANCE-35 TO 50 OHMS (AT 20°C) — #2-Fl MAX. CURRENT-30mA RMS. | oa VOLTAGE RATING-250 V. pro | “ INDUCTANCE -45 MILLIHENRIES APPROX ot 1 #3-S2 oy RESISTANCE - 6500 TO 9000 OHMS (AT 20°C.) MAX_ CURRENT- 25 mAdc. VOLTAGE RATING - 250 V. NOTES: 1)-FOR_USE WITH CK6835/QK464A, CK7571, OR CK 7572 PERIPHERY OF A STORAGE AREA THIS TICKLER COll RECORDING STORAGE TUBES USEFUL ONLY FOR SLOW SCANNING SPEEDS 2)-TICKLER COIL 1S PROVIDED TO PERMIT COMPENSAT- - . ING-FOR IMPROPER FOCUS AT THE EDGES OF A PAT- 9) WHEN NOT REQUIRED, THE TICKLER COIL MAY BE TERN CAUSED BY THE VARIATION IN DISTANCE FROM = THE CENTER OF DEFLECTION TO a) THE CENTER OF 4)- SHELL. MATERIAL - ANNEALED SWEDISH IRON OR STORAGE AREA OF A STORAGE TUBE. AND b) THE EQUIVELENT are i eee Sob ad ng ial gs AGES Ee A N/1/59/1 Poge 4 of 4