MC60 Voltage chart

  Tube   Pin #     DC volts (zero input signal)
 12AX7    1          82
          2          0
          3          1.1
          6          360
          7          108
          8          111

 12AU7    1          284
          2          82
          3          92
          6          284
          7          62
          8          92

 12BH7    1          340
          2          0
          3          16.5
          6          340
          7          0
          8          16.5

 12AX7    1          430
          2          -45
          3          -45
          6          430
          7          -45
          8          -45

B+ 435 volt

Source: McIntosh Laboratory MC60 User's Manual.