F. H. Richardson's bluebook of projection (1935)

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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.