The CV2215 (commercially the 5545) is a Xenon filled Thyratron with reliable operation over a wide temperature range and is the big brother of the 5544 with double the current capacity.
The design use is for speed control of DC motors. Also specified for counting and sorting devices and electronic switching machines.
The filament needs 60 seconds heating time. The Thyratron is a pulse device and the anode volts and current are limiting values the average current is limited to 6.4 Amps. When conducting the forward voltage drop is 16 Volts. The grid can go negative by a maximum of 250 Volts. The de-ionisation time is 500 μ seconds.
The KB/D identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the D identifies the maker as Mullard Radio Valve Co., Mitcham.
The shielding hides the inner electrodes.
The top cap with ceramic insulation and within the stranded wire is encased in a glass tube.
A closer view of the multi stranded wire.
The wide glass tube envelope is 64 mm in diameter, and excluding the 4 special base pins, is 195 mm tall.
Reference: Data-sheet. Type CV2215 was first introduced in 1954. See also1954 adverts.
