On Sat, 17 Jan 2004 23:20:45 -0600, Big John
wrote:

. . .
The VHF radio was the SCR-522, a four channel (A,B,C,D) set that used
a 832 tube in the output. Channel 'A' was air to ground (tower).
Channel 'B' was air to air. Channel 'C' was an aux channel (fighter to
bomber ,etc) and 'D' was emergency channel (121.5 Mc). These channels
were crystal controlled and if mission called for other frequencies,
the Mechs had to change the crystals prior to take off.

The SCR522 (and 524) became the standard for a lot or ham radio
2-meter work in the 1950s.

Don
(NR7X)