  We consider non-critical heterotic strings compactified on $S^1$. For full
rank theories, they are related to odd self-dual lattices and are structurally
of the same form as the critical non-supersymmetric theories. For dimensions up
to 14 the associated moduli spaces are Coxeter polytopes already studied by
Vinberg and Kaplinskaya. In the heterotic string context, the Coxeter diagrams
of these moduli spaces are related through transformations representing the
process of dimension changing tachyon condensation of Hellerman-Swanson. For
dimensions 8 and 6 respectively on $S^1$ and $T^2$ we show that at special
points in the moduli space the subcritical string is the CHS background for two
coincident NS5-branes and the intersection of two such pairs. These
configurations are interpreted as an end result of condensing heterotic winding
tachyons along one or two Scherck-Schwarz circles at self-dual radius. We give
evidence that in the first case there is a T-duality between the pair of
NS5-branes and a recently constructed non-supersymmetric heterotic 6-brane.
