Sensibly equivalent¶ to:
The 813 is an RCA design. It is a high voltage, low current beam tetrode. This exhibit was made in Canada and is badged Marconi.
RCA published an annotated diagram of the main components of the 813.
The 813 is one of the largest valves used in HF amateur radio. Classic amplifier designs from the late 1950s would squeeze 1,000 Watts PEP from a single device for SSB use. In class AB2 the input power for AM or CW would be 500 watts.
The valve base would be mounted on spacers so that a blower could be fitted under the chassis and a stream of forced air cooling would pass over the envelope.
The anode is 53 mm long and 48 mm wide. The metal is 1 mm thick.
The classic envelope is 60 mm in diameter, and excluding the base pins is 170 mm tall.
Reference: Datasheet Type 813 was first introduced in 1954.
Absolute Maximum Operating Conditions¶
Updated April 05, 2015. shape:classic construction:glass.foot type:beam.tetrode age:1950.1960 base:ux7 heater:10.0v pins:7 pin:1.f pin:2.nc pin:3.g2 pin:4.g1 pin:5.bp pin:6.nc pin:7.f