Radio Wrangler said:
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The NRD525 was one of the better amateur receivers of its day in terms of large signal handling, but it was not as much better as legend has it.
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I have an NRD515 fed from a multicoupler - I have never suffered from cross-mod or any other artifacts - maybe because....
A Reaction Instruments 409-2 VLF/HF multicoupler feeds my HF receivers. The input amplifier is an MRF136 power MOSFET - max power rating 55 watts. You will leave your fingerprint on it if you touch it while it is on!
My Redifon R499 receiver has a push-pull RF amplifier after a preselector single channel filter. This uses four 5 watt 2N3866's and is practically bomb-proof! Unfortunately I don't have the crystals for it!
So the recipe for an RF amplifier is adequate filtering before any gain and good linearity with lots of headspace!