This note examines the feasibility of an improved slotted bolted connection for timber moment frames. In the present connection, steel tubes are inserted into drill holes in glulam, and the steel tubes are fixed to the glulam with resin injection. Aluminum splice plates with curved slots, or curved elongated holes, are fastened mechanically by using high strength bolts that go through the steel tubes. Since the compression due to bolt tension is fully supported by the steel tubes, reduction of bolt tension due to shrinkage of glulam can be avoided. The use of slotted aluminum splice plates allows stable energy dissipation due to smooth sliding between the aluminum splice plates and the end surfaces of the steel tubes within the specified range of rotation angle. Through quasistatic cyclic loading tests of two connection specimens, it was demonstrated that stable and nearly rigid-plastic hysteresis loops were obtained whose equivalent viscous damping ratio was more than 30 % in the ranges of rotation angle close to or over 1/50 radian. Although further improvement is necessary, the experimental results demonstrate the feasibility and potential of the present connection.