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Amazon.com: DEVMO 8-32V to 45-390V DC-DC High Voltage Boost Converter ZVS Step-up Booster Module : Electronics
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Amazon.com: High Voltage DC-DC Boost Converter 12V to 150V-420V 170V 230V 1.25V-12V 6.3V Filament Adjustable Step Up Power Supply 2-Way PSU DC Regulator Module for Tube Preamp/Nixie Tube : Electronics
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