New Intonation Chart for Eastman 526

[guidocorona]

"It [526] has the exact same bell size (12”) and bore size (.610” / .630”) as the M5050."

According to dillonmusic.com, the M5050 bell diameter is 12.205 inches, rather than 12.0 inches. Its bore is 0.610 inches and 0.638 inches.

Miraphone M5050T-SP-WC 4 Valve Compensating Euphonium, with trigger and case, Silver Plate - Dillon Music Web Store

These values appear to diverge slightly from those cited in this thread for the Eastman 526.

Best, G.

[ivanhouston]

I had my Eastman 526gs handy and got these measurements. Not completely sure if I got that right? This doesn't add much to the convo, I was just curious!

[davewerden]

I had my Eastman 526gs handy and got these measurements. Not completely sure if I got that right? This doesn't add much to the convo, I was just curious!

That's pretty close for the 4th valve bore measurement. In my own measurements I find that a little wigging of the two probe ends (in either the horizontal or vertical plane) can make a difference. In any case, it's about a 1.5% difference, which is not much of an "error".