Having made my first baritone anglo, I managed to find all the lower reeds I needed from a Wheatstone MacCann Duet (which was well past restoration) except for the low C. I have a good collection of French made harmonium reeds and used one to complete the anglo. The lowest octave of both reed types are all surface mount.
I'm now moving on to the bass anglo which will use a lot more brass harmonium reeds, and wondered why surface mount was used, rather than sinking them into the reed pan as with the conventional dovetail reeds? It's a lot easier to make the reedpans for surface mount, that's for sure!
The Alexandre reed frames I have are up to 5mm thick in the lower octave, and I have some bass Esteve reeds in 7mm frames. Surface mounting takes up a considerable volume of the air available in the chambers, sinking them into the reed pan would give more air in the same size chamber...... Would it improve the sound transmission as well?
American made harmonium reeds tend to be very much thinner frames, comparable to standard treble concertina reeds, around 2mm deep. Howard's picture in this thread shows what appear to be European made reeds in a nice thin frame too.....
Did frame size and weight add to the performance of the note?
I assume, and am open to correction, that French made harmonium reeds were easily available and for the relatively low volumes of such reeds required, the London based concertina makers would find it easier to buy them in to use, rather than tool up to make them?
I'd welcome any thoughts before finalising a design!