Ok..Those birds got a lot of use in the Iran-Iraq war, and the center barrels and wing boxes are fatigued. If any of these are really still flying, they are severely G-limited.
I think it could be French firms, is there a sanction on Iran right now?The AWG-9's are DEAD without replacement TWT's. Every single one of them. If they're working at all, it's on French or Russian tubes.
Also, they seem to have a hangup viz. Russia and their AF and per ACIG have trust issues, so the French seem to be the candidates. The PRC, has just started fielding airborne FCRs ..dont think they can manage on demand TWTs for which most of the specs will have to be reverse engineered..