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CV3710 / AR63 excitron
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This valve measures 385x90mm overall |
This is an excitron: a single anode, continuously excited, grid controlled mercury arc rectifier.
| Ratings for operation at 50 to 60Hz |
| Max PIV | 6.3kV | 10.4kV | 14.5kV | |
| Max average anode current | 10A | 6.7A | 3.3A | A |
| Max peak anode current | 60A | 40A | 20A | |
| Excitation current range | 1.4 to 3.1A d.c. | B |
| Grid voltage for sine-wave control | 50 to 150V r.m.s. | C |
| Grid voltage range for impulse control | 100 to 250V | C |
| Grid voltage negative bias for impulse control | 50 to 150V | C |
| Max grid circuit resistance | 10kΩ | |
| Grid voltage to prevent anode pickup | -10V | |
| Min cooling air quantity for max ratings | 40 Cu.Ft./Min | |
| Max cooling air temperature for max ratings | 40°C | |
| Min cooling air temperature | 5°C | |
A: Average anode current is the average of the instantaneous anode currents taken over a time interval not exceeding 15 seconds
B: The excitation anode is supplied with a low voltage from an auxiliary DC supply which maintains a continuous excitation current
between the cathode and the excitation anode. This maintains a continuous cathode spot independent of the main anode current.
C: For control of the output voltage from the rectifier the grid is held negative with respect to the cathode until the instant in each
cycle which the grid is made positive and current flows to the main anode.
The valve has the serial number 38050. The packaging suggests it contains 680 grams of mercury. The anode to cathode
voltage drop is between 14 and 17 volts at full load, and about 20 volts at light load.
Connections are: cathode: screw base; excitation electrode: side cap; Grid: metal ring; Anode: top connector.
| The graphite excitation electrode is designed such that
the stray magnetic flux of a choke in series with the excitation
supply and placed nearby will raise the electrode and strike an
arc. The choke will hold the electrode up and maintain the arc while
the voltage remains. |
Grid detail, cathode cooling fins and connector. The cathode must be forced-air
cooled with the air stream directed upwards onto the fins at about 45°. The valve
must be mounted vertically, cathode down. |
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