Photo courtesy of John Combs
The above Leslie S-5T horn is from an Alaska Railroad GP38. I took this photo in July 2002 while wandering around one of the Anchorage shops. I did a little bit of research about them and discovered the following:
S-5T is a shorthand designation for any Leslie 5-chime Supertyfon horn that uses the #25, 31, 37, 44, and 55 bells (the "T" chord). The actual model designation of a given horn may have additional prefixes and suffixes as follows.
Prefixes:
R=improved horn bells with spiked back caps
Suffixes:
O=some bells have swapped locations on manifold
relative to the standard arrangement
F=full openings in orifice dowel pins
R=one bell reversed (turned backward)
RR=two bells reversed
The horn pictured below is an S-5T-RRO, with the #31 and 55 bells reversed. Left to right, the bells are #37, 55, 25, 44, and 31. The standard arrangement (i.e. an S-5T-R) would have the bells in exactly the opposite order. Another common arrangement has the #44 and #55 bells reversed. For the sake of simplicity, a horn with reversed bells is generally referred to as an S-5T-R.
Factory tuning was: B major 9th (B,D#,F#,A,C#)
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