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PS for linestage tube pre-amp (12b4)
PS for linestage tube pre-amp (12b4)
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Old 11th September 2019, 11:26 AM   #11
Mark Tillotson is online now Mark Tillotson
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Join Date: May 2018
Location: Cambridge UK
Originally Posted by rayma View Post
Total Pd in the resistor is more like 2W due to ripple drop. Remember, that's being removed from the regulator to a cheap resistor. Then I'd use 10R 5W (or 10W if there's room).

On the other hand the regulator's already going to have to be on a large heatsink,
its simpler and cooler to just make that heatsink a bit larger than having a separate power resistor. But such a resistor will reduce the inrush current at startup, that might be important.
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Old 15th September 2019, 04:11 AM   #12
john_tracy is offline john_tracy  United States
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If you really are dropping 10V@1.2A across the regulator, that's 12W. That will require a fairly big heat sink. Consider connecting filaments in series and drop ~4V@0.6A, 2.4W. A little more voltage headroom could be squeezed out by using schottky diodes with less forward voltage drop.
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