[Milsurplus] ARN-6 vs. 7

[Ray Fantini]

Did the ARN-6 replace the ARN-7? Was the 6 a better or newer design? When were the last ARN-6 systems in use? Knew someone who found one lurking in the wheel well of a Pakistan C-130 back in the eighties. And what replaced them? There must have been some receiver between the old octal tube stuff and the ARN-59 series receivers, maybe something with seven and nine pin tubes. Looking for the ADF system to go with my ARC-38, ARC-55 and ARC-73 system and cannot imagine it would be an ARN-6, that would be the only radio with octals.
Ray Fantini KA3EKH