The 6DQ6  (P/N 154-0277-00) is a power pentode vacuum tube with an octal base and a skirted plate cap.

6DQ6 Tube

It is used in the power supply of the 503.

The suffix versions differ in shape but nor key data or pin-out:

  • 6DQ6 = 6DQ6GT
  • 6DQ6A (Tek 154-0277-00)
  • 6DQ6B = 6GW6

Links