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Topic: different interval pulls on same lever |
George Biner
From:
Los Angeles, CA
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Posted 7 Aug 2021 11:33 am |
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I have a Mullen RP -- the RKR knee lever lowers string 9 a half step but also lowers string 2 a whole step -- how is that accomplished in the mechanism? Do they use different positions in the bell cranks? Any enlightenment welcome.
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Guacamole Mafia - acoustic harmony duo
Electrical engineer / amp tech in West Los Angeles -- I fix Peaveys
"Now there is a snappy sounding instrument. That f****r really sings." - Jerry Garcia |
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Tim Carr
From:
Connecticut; East Haddam, Connecticut River Valley
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Posted 7 Aug 2021 12:33 pm
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If you look at the undercarriage you will most likely see that the bell crank pull for #9 is situated closer to the cross-bar than the pull for #2. Because the pull for #2 is further up the bell crank, it is a longer (and faster) pull relative to #9 by virtue of its distance further from the cross-bar. The cross-bar rotation is the same but the placement of the pull rod at the bell crank determines the distance of the pull (and the speed of the pull) relative to other 'pulls' on the same bell crank. The placement of each pull rod at the changer finger will also have an effect on the length of the pull.
*Note: if you're not the original owner and suspect that a previous owner 'tinkered' with the guitar, it might be in your best interest to check your guitar against the factory rodding chart. There is a short learning curve to understanding the rodding chart but either Mullen or some of the Forumites can help with that. I have an Emmons LeGrande that had been tinkered with to the point that nothing matched the factory rodding chart... at all. For the All Pull and Push/Pull guitars, timing is critical for strings to pull in unison. That's why a good steel will have multiple holes at the bell crank... timing.
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Emmons LL D-10 8x8
Emmons VP, MatchBox 7A
NV-112 w/Fox mod, PF-350
Last edited by Tim Carr on 7 Aug 2021 12:43 pm; edited 1 time in total |
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Georg Sørtun
From:
Mandal, Agder, Norway
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Posted 7 Aug 2021 12:41 pm
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Most adjust the slack on the rod-nut for string 9 lower, so string 9 starts to lower when string 2 is at the half-note lower point. That way string 9 lower acts as a feel-stop for string 2, and they end up fully lowered in sync.
Works well on most PSGs, but on some the balancing requires use of a screw or rod to trim the fully lowered note on one of the strings. |
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Tim Carr
From:
Connecticut; East Haddam, Connecticut River Valley
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Posted 7 Aug 2021 12:53 pm
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Georg has made a good point. There are usually a couple of ways to get to your result and some can get involved with the necessity of a compensating rod. Your copedent and the desired effect of the pull should be taken into account... where you want to land and when. There are also other mitigating factors such as half-stops if your guitar is fitted with one.
"Between any two steelers, there will be at least three opinions"
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Emmons LL D-10 8x8
Emmons VP, MatchBox 7A
NV-112 w/Fox mod, PF-350 |
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Al Evans
From:
Austin, Texas, USA
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Posted 8 Aug 2021 5:54 am Re: different interval pulls on same lever
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| George Biner wrote: |
| I have a Mullen RP -- the RKR knee lever lowers string 9 a half step but also lowers string 2 a whole step -- how is that accomplished in the mechanism? Do they use different positions in the bell cranks? Any enlightenment welcome. |
There's a manual available as a PDF from Mullen with a page on tuning, specifically the way string 9 works as a half stop for string 2. The procedure described works perfectly on my G2, and should work on your RP.
As someone already mentioned, you can get the factory rodding chart to verify that your setup has not been changed.
--Al Evans
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2018 MSA Legend, 2018 ZumSteel Encore, 2015 Mullen G2, G&L S-500, G&L ASAT, G&L LB-100, Godin A4 Fretless, Kinscherff High Noon |
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