11-12-2014, 12:24 PM
Mondial,
Yes I forgot 43 tube is also a 25V one. Makes it a bit easier. So you need to drop 17V. At 300mA it is 57 Ohm. About 5W dissipation. 10W resistor will probably do.
Yes I forgot 43 tube is also a 25V one. Makes it a bit easier. So you need to drop 17V. At 300mA it is 57 Ohm. About 5W dissipation. 10W resistor will probably do.