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The CV1128 thyratron specification was based on the commercial GT1C and had previously been known by other service codes such as the NGT2 and the VGT128.

This thyratron is from the 1930s and was used in timebases for Radar and television. At a defined grid voltage the valve, will rapidly switch to full conduction. The valve is turned off by reducing the anode voltage. Thyratrons are gas filled and can be considered as triggered gas discharges. The precision of construction gives the defined and reproducible operating characteristics. This valve not only has a high peak current but is designed for operation at up to 8,000 pulses per second.

The first computer, Colossus, used these thyratrons as pulse generators. The clock rate of Colossus was 5,000 cycles per second.

The KB/Z identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the Z identifies the maker as MO Valve Company, Hammersmith.

The outer cylinder hides both the cathode and trigger electrode.

Side on the cathode is on the left, the copper trigger electrode is centre and the screened anode lead is on the right.

The classic envelope is 44 mm in diameter and, excluding the B5 base pins, is 98 mm tall.

References: Data-sheet, ¹⁰⁴⁰ & ¹⁰⁴³. Type CV1128 was first introduced in 1937. See also 1937 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.