The genisters were definately undersized also, and I'm pretty sure it's mentioned in the old catalogue. I got myself a 90s kit in great condition last year, best kit I've had.It was mentioned as a feature in Premier Signia drums (not Genista) but Signia--in the Introductory catalog of the "pre-internet" time
the Rebound Four Or Rebound Three (can't remember which) catalog/brochure
zip both -> here
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probably the most underrated /future classic's at the moment
Signia's. even Bob Gatzen liked them ; )
The pitch will be the same at the same tuning since the shell size will be the same between the two same size drums. I did something similar with some old Gretsch timbales when I was young and stupid. I ovaled the insert holes of some large Ludwig lugs so they could angle away from the shell and bent some Ludwig bass drum claws so I could use the claws to clamp onto the bottom hoops of my Ludwig toms. I couldn't tell you what difference they had because they were tensioned so high because they were timbales.lower? higer? more sustain?
I think Timpani use a larger head because it is a drum that you change the pitch of often so it needs the extra amount of head to make that feasible.More sustain and a clearer pitch, which I'm not sure you need or want in a non-pitched drum. It's the extended collar on timpani concept applied to drum set. It's definitely the way to go on timpani, which typically use a head one inch bigger than the bowl (although some builders use two inches). A solution in search of a problem, or could be Pearl's answer to RIMS mounts, which came out around 1980.
The extended collar on timpani - where the head is at least two inches bigger than the bowl - is a fairly recent development - 60's or 70's? Up until that time, timpani heads fit a lot like snare and tom heads, and there were no problems changing pitches.I think Timpani use a larger head because it is a drum that you change the pitch of often so it needs the extra amount of head to make that feasible.