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.
Screens top and bottom and ceramic spacer insulators on the anode supports.
Looking along the grid axis with anode flanges for fixing and additional radiating area.
The classic envelope is 50 mm in diameter, and excluding the IO base pins is 126 mm tall.
References: 1039 Type 185BT was first introduced in 1949. See also1949 adverts.
