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Blonder-Tongue made two models, one with a single 6AF4 and a better model with a 6AF4 plus a 6AB4 as VHF "IF" amp outputting on Ch. 5 or 6.
We sold a jillion of both models back in the day in a deep fringe 'hole' served by translators. The received signal was always line-of-sight and strong enough to not need preamplification.
Just guessing, but this was factored into the design of the converters, ie., they were never intended for UHF "DXing"
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