Photo G shows the improved ventilation of the new cabinet introduced with run-J The A. Some PW-D dials will have a dark bronze color lacquer paint. The ad states that the rack mount HRO is available, "Your choice of finish, either rich grey or black leatherette. It is very rare now, only three being reported.
There were two correct power supplies for the FB-7, the AB provided the 2. Like Millen had observed with the hams, the Navy found their radio operators had little use for an S-meter, Crystal Filter or Bandspread coil sets. With 12 tuned IF transformers, the receiver was very selective. No S-meters, no crystal filters and most importantly, no external power supply.