The CV5262 (20P3) is an audio output valve designed for single end use in universal mains receivers. The 200 mA heater indicates a cross over between radio and television equipment. The probability is that 200 mA heater chains were to be found in small VHF monochrome television sets.
The Mazda valve was designed after the time when Mazda gave up their own version of the octal base and adopted the standard International Octal.
The cathode resistor was designed to be 180Ω and the anode load to be 3,700Ω.
The EN identifies the maker as Thorn-AEI, Sunderland.
We have the 10P14 in the museum and it has identical operating characteristics and pin connections and was designed for a 100 mA heater chain.
Made in England and the BVA initials. The control grid is wound on copper supports.
The Commercial Type designation of 20P3 and the Mazda brand appears on the other side of the envelope.
The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins, is 77 mm tall.
