Are the heads of the Generation D and Eb whistles interchangeable? Meaning, once you loosen the heads from the bodies will both heads fit both bodies? Or do they use different OD tubing for their bodies?
Yes, same spec. D is a stretched Eb or Eb is a cut down D, depending on your perspective. Only tube length and hole placement are different.
Thank you Mr. Gumby. That is exactly what I needed to know!
It’s a chicken-or-the-egg sort of thing.
If you think of Generations as being in pairs a 4th apart, you need both the D and the Eb to complete three sets.
Bb/Eb
C/F
D/G
Why they would be conceived and created in such pairs, who can say.
I do think it would have been better had it gone this way instead!
A/D
Bb/Eb
C/F
which we would gain a nice mezzo A, and lose the insect-like high G.