They are a dual matched pair of transistors. QA1 is PNP and QA3 is NPN. Chances are they should be able to be replaced by one of several functional equivalents if you can obtain them. A PNP substitute would be uPA75V. For NPN, uPA74V or 2SC3381. These are probably pin-compatible. The middle substrate pin (if there is one) may need to be bent, depending on the location of the hole.
Having said that, those substitutes are hard to find these days. Because of the lack of thru-hole dual transistors, and SMD transistors are readily available but mostly to small to easily mount, I have ordered a custom tiny pcb with a BC846BD equivalent, which is intended to be a drop-in replacement.