The CV1830 (commercially the 1B3GT) is a extra high voltage rectifier for supplying the final anode of picture tubes in television applications. The very high voltage capability makes the 1B3GT suitable for use in colour television receivers with a final anode requirement of 20,000+ Volts.
This is an American design and is optimised for 525 line receivers.
Working at voltages of the order of 25,000 Volts means that the electrons striking the anode will generate soft X-rays. The design of a bell shaped anode with the coated filament high inside the bell is to minimise the release of these X-rays. In service the line output valve and the EHT rectifier would be located in a screened compartment to shield the users.
Philips and Made in USA.
The commercial Type designation 1B3GT is also on the base cap.
The insulated helical filament.
Even with the microscope the filament is not sharp as the image is viewed at an angle through the glass envelope.
The wide glass tube envelope is 28 mm in diameter, and excluding the IO base pins is 83 mm tall.
Reference: Data-sheet. Type CV1830 was first introduced in 1946. See also1946 adverts.
