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POWER SUPPLY FOR SOUND SYSTEMS 489
Rectifier Tubes, page 498
14. ll«.\v arc rectifier tube filaments heated in a typical a.c
operated battery charger?
15. Describe the internal construction of a rectifying tube.
— 16. Draw and describe its plate circuit in a typical battery charger.
17. What happens inside a rectifying tube when its plate charge
swings positive with respect to its filament? When the plate swings negative ? .^t^u^ ' y
18. What does a rectifying tube do when operated with a.c
supply to its plate? -t
' " ' Half Wave and Full Wave Rectifiers, page 500 ■
19. What is a half-wave rectifying circuit?
— 20. What is a full-wave rectifying circuit? Describe its action. 21. Compare a sound power supply rectifier with an a. c. -operated
battery charger.
Power Supply Rectifier Circuit, page 501
22. Explain the circuits and action of a typical sound power sup
ply rectifier (figure 115).
23. Draw the circuit of a typical "brute force" filter.
24. Why does a loud-speaker supply circuit need less filtering
than a photo-electric supply circuit? t,
The Care of Tube Rectifiers, page 505
25. What attention and care must be given to the relay con
tacts of a power supply rectifier?
26. What common electrical apparatus will serve as a temporary
substitute for a defective filter part? .
27. What will happen if one tube of a full-wave rectifier circuit
burns out or becomes weak?
28. What will happen if a filter coil is short-circuited? If a
filter condenser is short circuited? If a filter condenser is open-circuited?
The Mercury Vapor Rectifier Tube, page 506
29. Explain in detail why a mercury-vapor tube is capable of
rectifying greater amperage than a vacuum tube of the .-.tine size.