Sensibly equivalent¶ to:
Type 811 is an HF/VHF transmitting triode rated for operation up to 60 MHz and therefore at one time widely used in military and professional applications at frequencies which other HF types cannot quite reach.
The 811 was popular valve on the War Surplus market during the late 1940s and early 1950s.
The data given is for Class C operation. The control grid current can be up to 35 mA. The overall rating is high for a valve of this size but, slightly derated, very suitable for amateur use in the higher frequency bands.
The classic envelope is 57 mm in diameter and, excluding the UX4 base pins, is 145 mm tall.
Absolute Maximum Operating Conditions¶
Updated April 20, 2013. shape:classic construction:pinch type:triode age:1940.1950 base:ux4 heater:6.3v pins:4 pin:1.f pin:2.- pin:3.g1 pin:4.f pin:tc.a