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A flashover arrester board for a cathode-ray tube comprises the printed circuit shown in Fig. 1 which forms part of the circuit shown in Fig. 2.
English (United States)
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Flashover Arrester Board
A flashover arrester board for a cathode-ray tube comprises the printed
circuit shown in Fig. 1 which forms part of the circuit shown in Fig. 2.
The tube pins engage the corresponding conventinally numbered
terminals 1 to 3 and 5 to 8 on the printed circuit board. Terminals
1 and 8 are heater terminals. From the remaining terminals extend
printed inductors, such as 9, so arranged that at least one edge of
each inductance is parallel to a part of the inner edge of a guard
ring 10 so as to provide a spark gap such as 11. The guard ring
10 is surrounded by an outer guard ring 12, both being connected to a
common earth strap suitable for a braided earth wire to be connected.
All earth points in the protection circuitry are taken to the short
strap 13. The inductors 9 oppose the rise of flashover current and
tend to dissipate the energy in the air and metal of the spark gaps.
Fig. 2 shows the Protection circuitry. Each spark gap 11 on the board is
represented by an air gap 14 in Fig. 2. For extra protection, conventional gas-
filled spark gap components 15 are connected in parallel with the air gaps. A
current loop 16 is provided for test purposes. Zener diodes 17 are connected
back-to-back between the heater supply conductors and earth.
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