I've owned both the Centurion and Alpha 99, which I
believe is quite similar to the 91B, except made in
Colorado vs. Bulgaria. Bottom line is you'd probably
be happy with either amp.
If you don't need full legal limit output, I'd
probably go with the Centurion. If you feel you need
the extra power (for whatever reason) go with the
Alpha.
The Centurion is a bit more broad-banded and happy
with slightly higher SWR than the Alpha. The vaccuum
relay in the Alpha 99 is slightly faster than the
Centurion (not sure about the 91B). The Centurion is
probably a bit quieter than the Alpha.
73,
Barry N1EU
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