Hi All, Having just posted my results with new cap, Neon's and sync gap I've just blown another Neon. Nothing dramatic just suddenly less output. Seems one Neon has gone output short. So to answer my own question, two 5Kv Neons require closer safety gaps than 1/4" to ground and 1/2" across the two - if they are rounded :-( So chaps it looks like I won't be bringing mine to the UK Teslathon. regards Viv Watts UK.