3HS8

       The 3HS8 is a miniature twin pentode that incorporates separate plates and #3 grids for the two sections together with a common screen,#1 grid, and cathode.It is intended for use as a compatible sync-agc tube in television receivers. Except for heater ratings and heater warm-up time. The 3HS8 is identical to the 4HS8 and the 6HS8.
       There are some heater ratings and characteristics of 3HS8. Average characteristics : are 3.15 V and 600 A. Heater warm-up time is 11 seconds. Heater supply limits: Current opeation is 600 ±40 mA. Maximum heater-cathode voltage: heater positive with respect to cathode : DC component is 100 V. Total DC and peak is 200 V. Heater negative with respect to cathode : Total DC and peak is 200 V . Heater warm-up time is 11 seconds.  Otherwise, there are also some maximum ratings about it. Plate voltage (each section) is 300 V. Screen voltage is 150V. Positive DC grid#3 voltage(each section) is 3.0V.Negative DC grid#3 voltage(each section) is 50 V.Peak positive grid#3 voltage(each section) is 50 V.Negative DC grid #1 voltage is 50 V.Plate dissipation (each section0 is 1.1 W. Screen dissipation is 0.75W. DC cathode current is 12 mA. Grid #1 circuit resistance is 0.5 meg. Grid #3 circuit resistance (each section 2) is 0.5 meg. Then, there are also some typical operating characteristics about it. plate voltage (each section) is 100 V. Screen voltage is 67.5V. Grid #3 voltage (each section ) is -10 V (min ) and 0 V (max). Plate current(each section) is 2.0mA max. Screen current is 7.0 mA min and 4.4 mA max. Cathode current is 7.1 mA min and 8.5 mA max. At last, there are some direct intereletrode capacitances about it(approx.). Grid #3 to plate(each section) is 2.0 pf. Grid #1 to all is 6.0 pf. Grid #3(each section) to all is 3.6 pf. Plate (each section) to all is 3.0 pf. Grid #3*section 1) to grid #3 (section 2) , max is 0.015 pf.
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