Sensibly equivalent¶ to:
The P61 is a purpose designed oscillator triode aimed at mixer circuits using an SP61. In this configuration and with careful layout good conversion conductance with low noise are achieved. The frequency of operation is around the 32 MHz mark. This would be for Band I television.
The P61 dates to 1941 when the UK television service was closed because of the war. Radar receiver use was the first application.
The reverse is plain zinc paint.
The classic envelope is 32 mm in diameter, and excluding the MO base pins is 70 mm tall.
References: Data-sheet & 1043. Type P61 was first introduced in 1941. See also 1941 adverts.
Absolute Maximum Operating Conditions¶
Updated January 04, 2022.