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The CV2217 thyratron (commercially the 6K25) has a peak current rating of 500 mA, a control ratio of 20, a voltage drop of 40 Volts, and operates at a maximum frequency of 20 kHz. This would make it suitable for timebase generation for TV and radar. This valve was designed by Mazda to replace the T31 thyratron. The 6K25 has identical characteristics to the T41 thyratron, also used in post WWII television receivers.

In use a capacitor would be charged through a resistor or a constant current source. When the voltage on the grid reached the critical value an avalanche breakdown of the gas would occur and the capacitor would be rapidly discharged. A high impedance sawtooth ramp would be available at the grid and a low impedance pulse available at the anode or cathode.

The KB/E identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the E identifies the maker as Thorn-AEI, Brimsdown.

The reverse and top are covered in zinc loaded screening paint.

The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 68 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type CV2217 was first introduced in 1953. See also 1953 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.