It's the same deal with regard to the taps. If you have serial numbers, someone
at the factory can probably look up what transformer it is.
As to the qualitative differences between these amps, the X350.5 has more
hardware and so has an advantage over the X250.5, and both are Class AB.
The XA100.5 is Class A, which would tend to account for the sonic improvement,
assuming you don't need the extra watts.
at the factory can probably look up what transformer it is.
As to the qualitative differences between these amps, the X350.5 has more
hardware and so has an advantage over the X250.5, and both are Class AB.
The XA100.5 is Class A, which would tend to account for the sonic improvement,
assuming you don't need the extra watts.