BRiMAR VALVES 6870

TYPE 6870

TRUSTWORTHY

MINIATURE

R.F. AND VIDEO PENTODE

The BRIMAR 6870 is a trustworthy high slope pentode for use as a small trans-mitting valve or as a video valve giving a larger output with low anode loads than an ordinary R.F. amplifying pentode.

RATINGS Heater Voltage ... ... ... 6.31or f 12.6 volts Heater Current ... ... ... ... 0.6 10.3 amp. Anode Voltage ... ... 300 volts max. Anode Voltage (la = 0) ... 500 volts max. Anode Dissipation ... ... ... 6.3 watts max. Screen Voltage ... ... ... ... ... 250 volts max. Screen Voltage (Ig2 = 0) ... ... ... 500 volts max. Screen Dissipation . .. ... ... 2.0 watts max. Control Grid Current (D.C.) ... . .. ... 3.0 mA max. Control Grid Circuit Resistance—fixed Bias ... 0.1 MS2 max.

Auto Bias ... 0.5 MSZ max. Cathode Current ... ... ... ... 50 mA max. Frequency of Operation ... 150 Mc/s max. Shock (Intermittent Service) ... 500 g Vibration (Continuous Service) 2.5 g

OPERATING CHARACTERISTICS (Class A) Va = Vg_ = 180 V, Vgl = Vg3 = 0 V, Rk = 56 ohm, Ck =1,000 µF, Vh = 6.3 V (parallel connection)

Min. Bogey Max. Anode Current ... ... ... 19 25 31 mA Screen Current ... ... ... 1.5 3.5 5.5 mA Mutual Conductance ... ... 7.2 9.0 10.8 mA/V Anode Impedance ... 170 kS2 Inner Amplification Factor (µg1 — g2) 28 35 42 Control Grid Voltage for la = 100 µA —9 —12 volts

INTER-ELECTRODE CAPACITANCES* Input ... ... ... ... ... 8.5 pF Output ... ... ... ... ... 7.0 pF Control Grid to Anode (max.) ... 0.025 pF

* With no external shield.

Type 6870 is a commercial equivalent to CV5121.

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