[Milsurplus] Can anyone ID these Aussie HF Intercept Receivers (used in Vietnam)

[Tom B]

The photo looks strange but they they are all R-390 or R-390A. There is 
something mounted above them.  Maybe a TTY demodulator. I am not sure.

Tom


On 9/8/2022 2:10 PM, Brian Harrison wrote:
> (the gent at email address below didn’t know specifics)
>
>
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