  We construct an amplifier that interpolates between a nondeterministic,
immaculate linear amplifier and a deterministic, ideal linear amplifier and
beyond to nonideal linear amplifiers. The construction involves cascading an
immaculate linear amplifier that has amplitude gain $g_1$ with a (possibly)
nonideal linear amplifier that has gain $g_2$. With respect to normally ordered
moments, the device has output noise $\mu^2(G^2-1)$ where $G=g_1 g_2$ is the
overall amplitude gain and $\mu^2$ is a noise parameter. When $\mu^2\ge1$, our
devices realize ideal ($\mu^2=1$) and nonideal ($\mu^2>1$) linear amplifiers.
When $0\le\mu^2<1$, these devices work effectively only over a restricted
region of phase space and with some subunity success probability
$p_{\checkmark}$. We investigate the performance of our $\mu^2$-amplifiers in
terms of a gain-corrected probability-fidelity product and the ratio of input
to output signal-to-noise ratios corrected for success probability.
