L7 - approx 1974
I just managed to get my hands on a 1970s Leblanc L7.
Not much is known about the L7s. I've read that they have a straight bore which would be remiscent of the earlier Symphonie models.
When I first put my measuring tools on it i quickly looked at the numbers, and not realizing they were backwards thought it was an R13 copy bore. But these are the numbers
upper tenon of upper joint = 14.67mm / .5775 inches (this has a thin metal tenon covering)
lower tenon of UJ = 14.80mm / .583 inches
FYI, the socket bore of the lower joint was .583 and the lower barrel bore was .5775
versus an R13 of
upper = 14.76/.5815
lower = 14.64 / .5765
This is an interesting design as it expands throughout the bore versus a shrinking. I'll be taking my rifle bore measuring tools and checking out if there are any specific steps in the bore. I quickly rolled it in and out earlier and then thought everything backwards .. oops
The barrel is unmistakenly Chadash-like though.
it has bladder pads and cork pads in the upper joint. From use the keywok is a bit sloppy and such ... and a nice old Bonade ligature with the Vandoren 5RV mpc that came with the purchase.
So after playing a bit and adjusting my airstream and throat I was able to get a very nice core tone with a very nice R13 "ring" to the tone.
Velvetly transitions between each note was also possible due to Leblancs use of slightly smaller toneholes than Buffet - and smooth finger movement. This slightly smaller toneholes seem to restrict the ability of creating greater dynamics with all things being equal to the larger toneholes but also allows easier coverage of the toneholes and a slightly better easier ability of creating smooth note transitions. We are talking slightly here .... i've noticed the same on other model Leblancs in comparing to other brands.
This instrument is a joy to play right now though needs a mechanical overhaul. As soon as I finish a M'pingo Chadash type barrel for my R13 I'll have a better comparison to make.
Originally Posted by original posting for those that read it
But putting some measuring tools to the body bore I've found that it is actually an R13 copy including a Chadash type design barrel.
I'll be making more accurate bore measurements soon
During the 1970s Leblanc tried a new form of nickle plating (we assume this) as many players found out that the plating starting kinda flaking in a way and creating burrs. The burrs are easily found on the ring keys. This can be quite annoying to any player. If you don't have a machine to smooth out these burrs then using 800grit or finer sandpaper would do just fine to making the rings nice and smooth again.
Quality-wise I find the L7 to be of great quality (other than the nickle plating, which is a BIG problem). all keywork is smooth in it's action, easy to reach etc. IT does come with gold plated wire stainless steel springs, unlike Buffet and Selmer paris who normally use blued steel springs.