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At first blush, it seems a crazy idea to use vacuum tubes for a low-voltage turntable power supply. So why do we do it? We found that the vacuum in the rectifier tubes not only isolates their plates from the cathodes, but also the power line from the drive circuitry.Because of this the RöNt works like a high class power line filter for our turntables. The purification of the mains noticeably improves the sound in terms of clarity, openness and spaciousness.
We changed the circuit to a single ended class A topography which gives a smoother and more transparent performance. The RöNt II delivers a stabilized output voltage of 24..25VDC, the output is short circuit proof.
The tube supply utilizes two high current low resistance pentodes (PL36) and one full wave rectifier (5AR4). All tubes are made for long life. Secondary AC voltage is rectified by the full wave rectifier and fed to both of the output pentodes via a line choke reducing even more mains noise. The output voltage is stabilized by controlling the output pentode stage.
For start up, the motor of our direct drive turntables needs about 500mA, the motor of our belt drive turntables needs about 150mA. Since we wanted to supply the benefits of our famous and unique RöNt for our direct drive models as well, we developed a new and more powerful circuit that meets the demands of all our models.
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