On the same theme as post 31, I have just been testing a batch of valves and came to test an ECC84. The card index gives 713ABC for this valve. See pictures below.
Each card is labelled TRIODE and using all three doesn't give any nasty results, suggesting the valve was good (including the phantom extra triode).
In the fourth picture I have overlaid cards B and C which reveals that they are nearly the same. The left-hand hole highlighted in yellow is present only on card B and the right-hand one only on card C.
Did Mullard correct this problem in a later revision? Can I solve this problem by discarding card C (or card B) or is there a completely different revised set of 713 cards?