Prime PM-990

Horn and photo courtesy Brent Lee

The PM-990 was Prime Manufacturing's copy of the Leslie S-3K. Externally, there are a few subtle differences between the Prime and Leslie horns, particularly in the shape of the bell and power chamber where they meet the base. The Prime castings are also somewhat heavier than Leslie castings, and the absence of the Leslie trademark on the manifold is a dead giveaway.

Factory tuning is: D# minor (D#,F#,A#)

Prime no longer manufactures locomotive airhorns, but examples of the PM-990 can still be heard on some former Burlington Northern locomotives. The sound is essentially indistinguishable from an S-3K.

PM-990 sound samples:

Courtesy Dave Decker:
Sample 1...539kB...25 seconds

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