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The 7025 is a high grade 12AX7 so it's obviously not original. But that circuit should have enough gain to use a low output cartridge. A pair of 50C5s oughta put out a couple of Watts easily. The three heater voltages add to 112.6, close enough to 120 I guess. To do the 50C5s justice a voltage doubler would be the best idea but that thing probably doesn't have one. In any case adding a stage of gain should be an easy change, just add one tube.
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