As per the Pinwiki recommendation that the tube upkicker 6 & 1/4 fuse be changed to 2 & 1/2, I made that change a couple of weeks ago and today it blew. Though I do have a Williams coil in mine that by the coil windings is only slightly more powerful than the original Gtb one, I've never had any issue with the kicker before in 20 years. Have never even blown any fuse in the game before. So just a note that 2 1/2 might be borderline if using the original coil or little bit stronger one. On the copy of the schematics I downloaded, whoever had scribbled things on it here and there seemed like perhaps they had the same issue. Original '6 1/4' is crossed out and they wrote '2 1/2', then crossed that out and made it '5'. I've replaced the blown one with a 4 amp to split the difference. I didn't have any 3 amp fuses but maybe one of those would "make it".
Perhaps it is related to which under-pf driver transistor is installed. Gottlieb recommended changing 2N5875s to 2N5879s for early-run BHs but with no explanation. All three of my under pf transistors are MJ15016s and my serial number is within their range where it would have the 2N5875s. But I've never had to replace any of them and can't really find what the equivalency is between the 2Ns and the MJ.