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Very interested to see tube schematics for this. I recently renovated a RC-45J - I replaced the cartridge with a 'new' stereo ceramic and wanted to boost the output a little. I used a 1:2 audio transformer which messed up the impedance matching, so I also added a JFET unity amplifier to provide the needed impedance. Maybe all a bit unnecessary, but a useful learning experience.
While I was doing this, I was wondering if I could build a tube version. One unit I came across in my googling was the Wurlitzer kit 87. I even found one on ebay, but I couldn't find a schematic for it, and anyway I discovered I had some JFETs lying around...
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