I thought I'd share the results of my experiments with bridges of different heights, thicknesses and woods on my tack head minstrel. I made two from aspen and two from cedar. All are horizontal grain.
The original is pine. 2 7/8 L x 9/16 H x 1/4 W x 1/16 - right in picture
The aspen bridges are:
(1) 2 7/8 L x 5/8 H x 1/8 W x 1/16 - left in picture
(2) 2 15/16 L x 9/16 H x 3/16 W x 1/16
cedar: (1) 2 7/8 L x 9/16 H x 5/32 W x 1/16 - left front
(2) 2 15/16 L x 19/32 H x 3/16 W x 1/16 - on banjo, very nice grain
The tonal results are:
The pine has a nice rich tone.
The aspen has a muted tone. I tried a thinner bridge construction w/ little discernible difference in tone.
The cedar bridge surprised me. It is bright and clear. I really like the sound!
Since I like a bright tone, I won't bother w/ any more made from aspen but I may give poplar a try.
Let me know If you've had success with other woods.