Sort of
The T-55 can trace it's ancestry back to the T-34 tank of WWII fame, through the T-44 and T-54. T-54s where first build in 1946, and the T-54/55 series where a darn good tank for the 1950s.
But not surprisngly, for such old technology, there is nothing in the tanks operation that is electronic. There are a few electrical parts, such as the engine starter and internal lights but simple electrical components are not effected by EMP. And even those parts are not necissary to run the tank. It has a built in pneumatic starter for the engine, optical gun sights, it's gun is hand loaded and so on.
The only part of a T-55 operating today that might be hurt by EMP is the radio and any range finders or night sights that have been installed since the tank was built.
The T-72 is a much newer tank, itself a decent of the T-55 via the T-62. The T-72 doesn't actually inheret much from the older tank though, other then a general design. Construction of the T-72 started in 1971, and was replaced in the early 80 by the T-80. The T-72 has more electrical components, and generally has been updated with electronics like night vision systems and so on. But once again, these are not necissary to run the tank.
Of course, the resistance they get to EMP doesn't actually do them much good. A T-55 could fire at point blank range and still wouldn't be able to penetrate the armor of an Abrams. In theory the T-72 might be a threat if it had a good crew (not many in Iraq), had high quality armor percing rounds (Iraq didn't have any in the Gulf War), and had some air cover (not a chance in hell in Iraq).
Jay