| 摘要 |
849,925. Cathode-ray tube operating circuits. METROPOLITAN-VICKERS ELECTRICAL CO. Ltd. March 3, 1958 [March 6, 1957], No. 7428/57. Class 40(7). In a cathode-ray tube (C.R.T.) E.H.T. circuit Fig. 2 one resistor chain includes high-gain triode Vl and brilliance control R and resistors R1, R2, R6-R9 are so proportioned that the C.R.T. grid-cathode voltage is independent of E.H.T. voltage variation. During time-base sweep brilliance pulses are applied via potentiometer R. A diode may be added to prevent the C.R.T. grid rising above cathode potential. In another embodiment Fig. 1, not shown, only two resistor chains are used. |
