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Cossor 185-BT television line output valve
The 185BT is a television line output valve.
The cathode resistor should be 160 Ω and the positive anode surge is a maximum of 8,000 Volts. The anode maximum dissipation is 25 W and the screen maximum dissipation is 5.5 Watts. The high voltage design can be seen in the ceramic insulators. The classic envelope is 54 mm in diameter, and excluding the IO base pins is 122 mm tall.
The 185BT was first introduced in 1949.