551: In the movie Phenomenon, what was the make and model of the HF rig that was used?

552: The filament of a 12AX7 tube could be operated with only 6.3V AC.  

553: A tube with a type code beginning with a "7" usually..

554: Ten-Tec is located in the mountains of Tennessee. Decades ago, another well known amateur manufacturer was located across the mountains in Mars Hill, North Carolina. Who was it?

555: If you blew the final tube in your Heathkit DX-20 transmitter, where might you find another one?

556: Besides amateur transceivers and linear amplifiers, where would one expect to find type 6LQ6 tubes?

557: If his presidential election had gone the other way, there might have been a tri-band beam up on the roof of the White House. Who was this amateur that made an unsuccessful bid for the presidency?   

558: Heathkit was noted for offering kits to build which of the following?  

559: In what 2000 motion picture did ham radio play a major role?    

560: In what John Travolta movie did the star have a friend who was a ham radio operator?    

561: One of the episodes of the TV series "Touched by an Angel" featured a young boy who was a ham radio operator.

562: The GAP "Titan" vertical antenna uses how many "traps?"

563: The Swan 260 HF transceiver lacked which feature?

564: What did a USA Class B operator gain by upgrading to Class A?

565: What is the Maximum permissible CW speed permitted for identifying an amateur radio repeater?

566: Swan amateur radio gear was made in...

567: An amateur radio antenna in the U.S.A. may exceed 200 feet in height.

568: Which of these bands is significantly misnomered?  

569: Prior to licensing in the U.S.A., radio operators made their own call signs. What call did Hiram Percy Maxim use in 1911?

570: The "National Radio Quiet Zone" affects what state?  

571: What frequencies form the imaginary boundaries of the 75 meter DX window.  

572: Which of the following bands was -NOT- one on which a Class B operator could operate CW in 1949?

573: How many of the United States are represented by FCC call districts 6 & 7?

574: A successful E-M-E (earth-moon-earth) signal travels approximately how many kilometers?

575: Of the 10 U.S. FCC call districts, how many districts have 3 states each?