Raymond R. Dickey, the senior partner in one of the District of Columbia, most influential law firms is quitting to set up a law office with his wife.

Dickey said he was leaving Danzansky, Dickey, Tydings, Quint & Gordon after 35 years because of philosophical differences.

Dickey said he wanted to maintain a small to medium-sized practice while the other partners in the 42-member firm want it to continue to grow, both in numbers of lawyers and nationally known clients.

Under a contract that dissolves Dickey's relationship with the firm, he and the senior partners agreed not to make public their differences. They also agreed that the name of the firm would not change.

Dickey said he plans to establish a new firm of 10 to 12 lawyers. He acknowledged that although he has had differences with his old firm for some time, he delayed his departure until after the death of Joseph B. Danzansky, one of the firm's founders, who died Nov. 8 after a long bout with cancer.

Other members of the firm include former Sen. Joseph D. Tydings (D-Md.) and D.C. Democratic chairman Robert B. Washington Jr.

Dickey's wife, Margaret L. Dickey, currently is a consultant to the President's Commission on World Hunger and Malnutrition.