Prestolite Horn Demystifed

Dana67Dart said

I have not tried this but there are programs for Smart Phones that will listen to a sound and give you the frequency.

Do that on a known good horn then tune any other to the same frequency.

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Yes. Great idea! We have a baby grand piano in our living room. The lady who tunes it once a year uses her I phone. She can duplicate any key and tone. I don’t play so I do not follow. Well- I can play chopsticks. lol!
So if they have that program you know there are others.
Syleng1