  We report our experimental results on phase-sensitive amplification (PSA) in
non-degenerate signal-idler configuration using ultra-narrow coherent
population oscillations in metastable helium at room temperature. We achieved a
high PSA gain of nearly 7 with a bandwidth of 200 kHz, by using the system at
resonance in a single-pass scheme. Further, the measured minimum gain is close
to the ideal value, showing that we have a pure PSA. This is also confirmed
from our phase-to-phase transfer curves measurements, illustrating that we have
a nearly perfect squeezer, which is interesting for a variety of applications.
