First, if you haven't already verified that everything is functional, please do so. Non-functional pieces will likely need capacitors replaced at the minimum. 4DD5 is likely to need work.
LR-4000 has an internal MM phono preamp. It will also has an SQ decoder and will decode other matrix systems, as well as synthesize Quad from 2 ch. It can be set for magnetic (MM) or ceramic (cheapo) cartridges. Although it was only sold by Lafayette, it garnered sparkling reviews in the hi-fi magazines. It features a full-logic wavematching SQ decoder which was one of the reasons it got high marks. It was their flagship model.
As to phono cartridges, the JVC is a standard output cartridge. It will need no additional preamplification through the 4DD5 or LR 4000 phono input.
The 4DD5 has an internal phono preamp. The 4DD5 Quad output is preamplified. The switch next to 2 channel direct out will allow either a 2 ch pass through WITHOUT preamplification OR WITH preamplification, depending on the setting.
Hana model SL is MC w/Shibata low output. Both models E & S are available as high or low output. SL will need a transformer or pre-preamplifier to boost the signal. Likely you knew all this.
BOTH cartridges should be able to reproduce extremely high frequencies for CD-4 demodulating.
Here's what David at Audio Karma had to say about the turntable:
Watch the tracking on that model. I sold them back when new. There was a run of them that had binding tonearm bearings. You'd notice it as the arm tracked across the LP.
In this case, the stylus would 'walk' out in front of the cartridge. That is, the tonearm would not follow the stylus in the groove and eventual mis-tracking would occur.
This was due to the bearing race at the bottom of the tonearm being too tightly bound. You'd have to remove the tonearm, break the sealed double-lock-nut and then retighten the nut on the bearings. We had a number of them returned until JVC USA figured out what the problem was. They never issued a service bulletin, though.
Got a fair amount of warranty money once I figured out what the problem was, too.