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The pre-pulsar is a common predecessor of the pulsar. It duplicates itself after 15 generations, although it fails to be a true replicator because of the way that the two copies then interact.
A pair of tubs can be placed to eat half of the pre-pulsar as it replicates; this gives the period-30oscillatorEureka, where the pre-pulsar's replication becomes a movement back and forth. The replication of the pre-pulsar can also be made to occur in just 14 generations as half of it is eaten; this allows the construction of period 28 and period 29 oscillators. The pre-pulsar was a vital component in the construction of the first oscillators of periods 26, 28, 29, 47, and 55.
A skewed pre-pulsar is like a pre-pulsar, however, the pre-traffic lights it is composed of are vertically skewed by two cells. Despite this it manages to replicate itself and becomes two skewed halves of a pulsar. This form, however, is unstable and so is not truly a pulsar predecessor, but it can be hassled similarly to a normal pre-pulsar by oscillators and spaceships.
Other pre-pulsar like formations, such as 3 in a row (Ash on Catagolue: here) instead of 2, also duplicate themselves like the others, but are not stable.
The smallest pre-pulsar and pulsar predecessors have seven cells.
Gallery
#N Skewed pre-pulsar
#C This pattern evolves similarly to a pre-pulsar, but it is unstable.
x = 9, y = 5, rule = b3/s23
6b3o$6bobo$3o3b3o$obo6b$3o!
#C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
#C [[ THUMBSIZE 2 ]]
