Three, 110 GHz, 1 MW, 10-s pulse gyrotrons are being constructed at Communications and Power Industries (CPI) for use in electron cyclotron heating (ECH) experiments on the D-IIID Tokamak at General Atomics in San Diego, CA. The design of the "production" gyrotrons is similar to that of an experimental device that has been described in earlier reports. The most notable difference is the use of a single-anode electron gun in the new devices instead of a double-anode design. While the double-anode gun provides more flexibility in adjusting beam parameters and beam size, the single-anode gun produces a beam that is less likely to produce spurious modes on the rise and fall times of the pulse. Other differences include minor modifications in the TE/sub 22,6/-mode cavity design to inhibit competition with neighboring cavity modes and a substantial simplification in the cooling scheme for the device by reducing the number of individual cooling circuits by a factor of three.