A little more effort any you could patch the old tuner's IF output into the new chassis. Both should have the same IF frequencies and impedancce levels (around 50 ohms Z). Looks like the new tuner is a small metal box on the new set's circuit board, just cut a trace on its IF output, and patch the tube tuner's IF at that point into the new set's IF amp (check that there's no DC riding on the IF!). AGC might be an issue if the tube tuner wants AGC. You could probably rig up an op-amp level and gain shifter circuit to take the new set's AGC line to convert it to what the tube tuner would want to see.
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