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Not a bad part, and good for tube B+ with relatively low current requirements such as lower tube count battery sets. The LM317 chips CAN handle over 125V in, but can only regulate the voltage down (drop) to 80V due to the 45V max Vin to Vout differential spec. If you need more current (up to 1.5A), but less Vin to Vout drop than 45V the lm317 is a good choice.
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