BYRD BIDS LANCE QUIT AFTER SENATORS HEAR TESTIMONY THURSDAY
Sen Dem leader Sen Robert C Byrd bids Lance resign; says Lance should be given fair hearing; says Lance's effectiveness as Budget Dir has been destroyed; says damage to Carter Adm from controversy is not irreparable, but could become so if Lance remains in office and if Carter does not force resignation; Pres Carter describes Byrd's statements as 'balanced,' NJ pol trip; says he was unaware of Lance's problems prior to nominating him; acknowledgment by White House aides that they were apprised of Lance's problems noted; other Cong reprs calling for Lance's resignation noted; Byrd illus (M)