I have used 6EJ7 in LTP with good results. Not all of them are the same, and there is a good deal of difference between the tubes made by different vendors, and especially between the US made tubes and everybody else.
either 6J11 2 X 6EW6 would work great too but I have no spice models for them. Ok the 6J11 and 6BN11 I think are just different pinouts.
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6BN11, 6J11, and 8CB11 are nearly the same as 6EW6. 6J11 has a small grid 1 bias shift (0.5 V) from the others.
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