JayeNM
Well-Known Member
- Messages
- 3,825
- Location
- New Mexico, US
The 25m and 4m measurements...yours above...and your previous ones including the neck diameters....indicate that these are the same design.I measured the diameters of the bell, body, and bow in four zones for three altos, using a caliper
Conn 4М:
1 - 59,5mm
2 - 60,1mm
3 - 57,9mm
4 - 48,6mm
Conn 25M:
1 - 59,6mm
2 - 60,3mm
3 - 58,3mm
4 - 48,9mm
King 670:
1 - 58,8mm
2 - 59,9mm
3 - 57,8mm
4 - 48,7mm
The results vary. And if we consider the data I obtained earlier (post #70), we can conclude that the instruments are completely different. It will be very interesting to see the data for the King 660 and Conn 24M. I had King 660 a long time ago, but I don't have one now. Who owns a Conn 24M and a King 660 right now?
The differences/variances in measurements (.4mm maximum you have noted) above) are within variance allowances of US factory fabrication of that time period.
If you say the 4m and 25m play and sound differently, I would next look at the natural pitches of the necks of each -scroll back up to that vid I posted on necks....and see if , after running the tests shown in the vid...what your results are.

