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It's just a typo. You inject the signal at the grid of the first 6J5, the mixer (the one the schematic refers to as translator).
This circuit gives a lower noise floor than a 6K8 mixer/osc would, so it should make a decent DXer.
I have a Philco around here somewhere using a similar circuit but with a 14AF7 instead of two 6J5s. It works very well and seems to dig right into the atmospheric noise.
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