Step 19: Q6 - Q9 = 4x MPSA92 Hi voltage transistors
Watch the orientation on these transistors, making sure they match the diagram. Make sure you read the labels correctly on all transistors and don't mix them up!
Install Q6 through Q9 in a row to the left of the MPSA43 transistors, to the right of the coil. Installed in proper location and orientation, they should look like the photo below, flat side toward the bottom.