If it depends on me I will reduce armour on T-26
T-26 M1931 with two turents
HF - 2 (armour is inder some angle)
HS - 1
HR - 1
TF - 2 (armour is inder some angle)
TS and TR - 1
T-26 M1933 with one turent very similar to 7TP
HF,HS,HR - 2
TF,TS,TR - 2
T-26 M1939 with one turent
HF,HS,HR - 2 (angle of armour is not enough to value 3)
TF,TS,TR - 2 (angle of armour is not enough to value 3)
Probably someone another should make clear this.