Seventh Circle Audio

in the schematic it doesn´t labeled this value
the zenner is between the LM317T output and the base of the TIP31B

thanks.

1N5253, 25V 1/2W Zener. This is part of a clamping circuit I've added to the latest rev of the PS02, since too many people were inadvertently blowing up the LM317HVT by shorting the +48V output to ground during assembly and testing.