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Emmons P/P pedal not holding pitch

Posted: 10 Oct 2022 7:56 pm
by Ian S. Cameron
I'm wondering if anyone has any insight...

I have a 1974/75 Emmons d10 push pull. I tune the "b" pedal on string 6, let off the pedal, try it again & it's instantly out of tune. Not by a lot, but enough to be noticeable.

I tune using the stroboplus, and also cross reference against ear tuning (tune a perfect 5th between the e's and the a's). I always tune the "b" pedal with the "a" pedal depressed as well.

Thanks in advance,

Ian

Posted: 10 Oct 2022 8:40 pm
by Ian Worley
Lots of possibilities. Presumably the open string is in tune when you tune the raise and release the pedal correct? When you re-engage it is the raised pitch now sharp or flat? Do you also have a lower on 6? Is there a shock spring on the B pedal raise? Wound or plain string? How old is the string?

Posted: 10 Oct 2022 10:54 pm
by Henry Matthews
Sounds to me it’s not being pulled all way to body stop. Make sure when pedal is depressed, it’s going all way to stop and returning all way to end screw.

Posted: 11 Oct 2022 1:48 am
by Jon Light
Sparse enough info here that another dozen people can throw ideas at you. Here's mine -- make sure that the bellcrank is tight on the shaft. Not really consistent with what you describe but it's an issue that has plagued me more than once.

Posted: 12 Oct 2022 2:32 pm
by Dave Campbell
i've had this issue in the past and have it again right now.

i fixed it before but i can't remember how. i think i just loosened the collar and reset it. i have a compression spring on that raise.

mine stays in tube for a bit, but the tuning with b pedal down will slip flat. the open string is staying in tune.

in my case, i think i would change the strings, as i suspect that the 6th string (plain) gets tired faster.

i also wonder if the hex raise screw is rotating, necessitating some retuning.

Posted: 12 Oct 2022 3:26 pm
by Abe Levy
I would loosen all the collars on that pull, tune the changer with your hand. Then reset the collars. If it’s not set up correctly you’re always going to have troubles. As Henry pointed out, it’s got to hit a solid stop and the screw as well. The only way you can really be sure is to set the finger by hand (as opposed to using the pedal or lever.

Posted: 12 Oct 2022 4:12 pm
by Abe Levy
Double post deleted.

Posted: 13 Oct 2022 1:23 pm
by Donny Hinson
I tune* the "b" pedal on string 6...
Way out of my area of expertise, but are you tuning* with the tuning key on the key-head, or the hex screw at the endplate?