Bulb horn fun
Posted: Wed Jan 04, 2023 9:06 pm
One of the perks for buying an older restoration rather than doing your own ground-up restoration is the opportunity to tinker while maintaining it. For one or another reason, I couldn't get sound out of the bulb horn. Reasoning (incorrectly ?) that an air blast from the bulb would be lessened by having to compress a column of air in the flex-tube, I re-located the reed from the horn end to the bulb. I could get a sick goose honk by blowing on the connection, but it took both hands on the bulb to force a sound out of it.
I decided to fiddle with the reed. On examination, I found the edges of the reed were pretty rough, formed by shearing. I smoothed the edges with a fine file, and reasoning that a thinner "flap" would likely respond better to lighter air pressure, I filed the "flap" a bit.
A test "honk" proved successful, but I wondered if less air would be required to produce sound if the "flap" was shorter. Using a tiny elastic band, I "bridled" the flap, and found it not only did make sound with less effort, but moving the bridle "tunes" the horn. The less "flap" length free to vibrate, the higher the pitch. Your sick goose can sing from basso profundo to soprano depending where you place the bridle.
I decided to fiddle with the reed. On examination, I found the edges of the reed were pretty rough, formed by shearing. I smoothed the edges with a fine file, and reasoning that a thinner "flap" would likely respond better to lighter air pressure, I filed the "flap" a bit.
A test "honk" proved successful, but I wondered if less air would be required to produce sound if the "flap" was shorter. Using a tiny elastic band, I "bridled" the flap, and found it not only did make sound with less effort, but moving the bridle "tunes" the horn. The less "flap" length free to vibrate, the higher the pitch. Your sick goose can sing from basso profundo to soprano depending where you place the bridle.