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A single 6AV6 or 12AV6 resistance capacitance coupled stage preceding the output tube, will really kick the gain up a notch, and let you use a ceramic cartridge in place of the old crystal one. Attached is a basic circuit of a phono amp you can use as a guideline, from the GE tube manual. Note that if your output transformer does not have a hum bucking winding, it is fine, you can still use this basic schematic.
You may need to employ a bit of creativity to get the heaters wired up properly, but you can use the component values from this schematic for a good starting point.
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