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On the Red Head box, I can't answer that because I haven't got one, but I would think it's a fixed ratio. Your SPA-AE box is NOT a 22:1 as that would be a manual box not a PS box. SPA-AE is a 17.5:1 ratio. >1/2/73. I think you just looked at the wrong line. The manual box tag for the 73 would be SMA-T @ 24:1 ratio. (according to my Marti Tag book.)
