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At night, its glowing filaments light (and heat) the whole shack. In a pinch, an amplifier can make the difference between getting through and closing the log empty, whether it's in a DX pileup or in an emergency. This installment of the Crossword Puzzler celebrates the ham's equivalent of the V-8 engine and wide tires--the linear amplifier and its reliable workhorses, vacuum tubes.

Ward Silver, N0AX, (aka The Harbinger of High Voltage) is the author--among numerous other things--of the Amateur Radio Crossword Puzzler, which appears twice a month on the ARRL Web site. He can be reached by e-mail at n0ax@arrl.net.

Across

1. Not tight
4. Current across a gap
5. Removing heat
9. Thermal energy
10. Low gain
11. One-billionth
14. Thousand kilowatts
15. Power Amp (abbr.)
16. Az-_ _
17. The means of adjusting
21. Varying voltage
22. A pair
23. Electron source
26. Wattmeter (abbr.)
27. Titanium (symbol)
29. Contains a vacuum
31. These raise the temperature
32. Output network
35. Legal maximum is a full ...
36. Safety mechanism
42. Distance (abbr.)
44. Waveguide (abbr.)
45. Full Break-In (signal)
47. Unwanted oscillation
48. Adjust to the same impedance
51. Inductor
53. Excessive power
54. Cut or trim
55. Radio Frequency (abbr.)
56. Old tubes get like this
61. What always comes first
64. Four element tube
66. Stainless Steel (abbr.)
67. Unit of conductance
68. Boolean complement to AND
69. Magnetically-controlled switch
70. Where the drive goes
71. Trust
72. Aluminum (abbr.)
73. Most positive electrode

Down

1. Replicates accurately
2. Electrical jolt
3. Engineer (abbr.)
4. Antenna Tuner (abbr.)
5. Stores electric energy
6. Old Timer (abbr.)
7. Not high
8. Smooth surface on ceramic
10. Lights up under power
12. Controls amp gain (abbr.)
13. High Power (signal)
14. Measuring instrument
18. Rarest Tenth District state (abbr.)
19. Adjust frequency
20. High temperature
24. Shows plate current resonance
25. Voice level units (abbr.)
26. Watt-hours (abbr.)
28. Changes AC voltages
29. Use your voice
30. Frequency range
33. Prefix for two
34. Touch the HV and you'll be one of these (abbr.)
37. Normally Open (abbr.)
38. Prefix for a billion-billion
39. Dummy
40. Glass air guide
41. Controls gain (abbr.)
43. Variable transmit tuning
44. First bit of smoke
46. Mode with a steady carrier
49. At a previous time
50. Stop the action!
52. Intermediate frequency (abbr.)
53. Contaminated vacuum
57. The best price
58. From (abbr.)
59. Keeps RF current out
60. Natural antenna support
62. To stop working
63. Switch between talk and listen (abbr.)
64. Not the bottom
65. Remove water
66. Hang down in the middle
67. One thousand kVA (abbr.)