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The 150 Ohm resistor in the heater string seems high. With 300 mA through it, one gets 45 Volts, too much drop. The 90V motor and 25V heater already give 115V. Otherwise there isn't enough heater current. Maybe you made an error, and the heater needs to connect separately to the ground symbol.
Also be advised that the cartridge is hot to the power line so its connections should not be accessible with fingers while manipulating the tonearm.
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