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Post new topic Diminished 7th Chord on U12: Intonation (C6 also?)
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Author Topic:  Diminished 7th Chord on U12: Intonation (C6 also?)
Daniel Morris


From:
Westlake, Ohio, USA
Post Posted 5 Oct 2017 9:10 am     Reply with quote

Well, I saw a recent thread for a dim7 chord on E9, and lately I've been questioning my ears in tuning strings 5-8, P5 & P6, E9/B6 Universal tuning.
I assume there's no one perfect solution, but I'd like to get some ideas/tips. I use a Peterson tuner, but end up having to tweak several pitches, including the P5 & P6 changes.
Is it impossible to avoid some "beats",as I suspect, or have some of you U12 (or C6) players found a great solution to that chord?
I've heard suggestions of straight 440, Just Intonation and just tweaking by ear.
I'm all ears, so to speak....
_________________
1979 MSA U12 Pedal Steel w/ToneAligner pickup
1984 Kline U12 Pedal Steel w/Alumitone pickup
2011 Bear Creek MK Weissenborn
Milkman 85W PSG and 40W Mini amps w/Telonics 15" speaker.
Dr. Z Surgical Steel w/Eminence 15" speaker. Spaceman, Retro Mechanical Labs, Fairfield Circuitry, Z Vex, Pigtronix, Red Panda, EHX, Empress Effects, Strymon, Eventide.
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Ian Rae


From:
Redditch, England
Post Posted 6 Oct 2017 2:26 am     Reply with quote

The diminished 7th is inherently dissonant, so don't hope for a beat-free recipe. If you set up your P5 & P6 to give a satisfactory D9 & F9 respectively*, then both together will give you a serviceable Cdim.

It gets complicated if you want to go further and lower string 3 to give you B7. Then you find that you are trying to use the Eb that gave you F9 as a D#. I exploit the fact that in a 7th chord we are quite tolerant of what a flatted 7th actually sounds like - any ratio between 7:4 (1.75) and 9:5 (1.8) will do. I tune the B so that it makes a correct minor 6th with the Eb/D#. The interval between B and A feels fine, but like I said the 7th isn't critical. The F# on the 5th string is a bit sharp, though. If you are using a traditional thumb-plus-two grip that doesn't matter; in the four-part chord it's tolerable.

I tune by ear - how you would achieve this with a tuner I have no idea.

* I'm talking C6 pitches but the same principles apply to B6 uni, which is what I play.
_________________
No-name 60s D10 8x5, homebuilt Uni 12 7x5, Hilton pedal, pair of Fender 112s
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Daniel Morris


From:
Westlake, Ohio, USA
Post Posted 6 Oct 2017 4:03 am     Reply with quote

Thanks, Ian.
I should have been a bit more clear: I always fine tune by ear after using the Peterson.
I only mentioned it because I wondered if anyone else using that has found a sweet spot for P5 & P6 in that tuner.
_________________
1979 MSA U12 Pedal Steel w/ToneAligner pickup
1984 Kline U12 Pedal Steel w/Alumitone pickup
2011 Bear Creek MK Weissenborn
Milkman 85W PSG and 40W Mini amps w/Telonics 15" speaker.
Dr. Z Surgical Steel w/Eminence 15" speaker. Spaceman, Retro Mechanical Labs, Fairfield Circuitry, Z Vex, Pigtronix, Red Panda, EHX, Empress Effects, Strymon, Eventide.
View user's profile Send private message Send e-mail

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