Audio Note Interstage Mono Block 300D Instruction Manual page 48

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Then check the other side of the last 15K resistor and you should see about
300V DC.
Then measure the voltage at input to the 15 resistors and you should see 418
volts – this is also the output of the CHOKE 165 in the power supply.
Let's continue working back and measure the DC voltage at the output of the
150R resistor and we see we have 434 volts and then check the DC voltage at
the input to the 150R resistor.
Here you can see we have 462v – so as you can see we have seen the DC
voltage start at 462 volts right out of the 5AR4 tube and then we step it down
through the power supply.
Well done if all your DC voltages are good – now let's move on to the next
testing stage!
Page 48