▼ Menu

CV1128

Sensibly equivalent to:
AN1 GT1C ME1502 NGT2 POVT189 VGT128
See also:
The World's First Computer
    
Extras ▼

 

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. Most 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 operating speed of Colossus was 5,000 cycles per second.
The classic envelope is 41 mm in diameter and, excluding the B5 base pins, is 100 mm tall.
References: Datasheet, 1040 & 1043. Type CV1128 was first introduced in 1937.

 

Pin Connections
B5
1
2
3
4
5
a
g1
h
h
k

 

Absolute Maximum Operating Conditions
Thyratron
Vh
Ah
Va
mAa
4.0
1.35
500
1000
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 09, 2013.
Return to Main Index