[Herald1360]

The E*4* series of valves with B8A base has a fairly limited range of types- it was seen off quite quickly by the 9- pin B9A range which offered more pins and a simpler socket with inherent polarization similar to the earlier 7- pin B7G (the first popular all glass valve range).

So if it's the right sort of valve for its position in the radio, it's probably the right valve and will almost certainly work anyway.