In 1921/22 we lost 6 on the trot to only 3 different teams - Spurs, Villa and Oldham. Back then it was common to play the same team back to back.
In December 1963 we lost 6 on the trot to 5 different teams due to a Christmas double header with Preston.
In September 1966 we lost 5 on the trot to 5 different teams, but conceded 4 at Blackburn, 5 at Bolton and Charlton and 7 at Wolves. We'd then concede 4 to Hull and 7 to Plymouth in the October.