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Discussion Starter #1
I have an Ibanez RG770DX I purchased new in 1991. It came new with a F2 in the bridge and a F2 in the neck. All these years I thought at the factory they must have just thrown two F2s in there. I am in the process of restoring it to it's original beauty and had never tested the resistance in the pickups until today. Come to find out they have a 9.12 and 9.39 resistance. I know that it was supposed to have a F4 in the neck and the F4 resistance is somewhere around 9.94. Could one of these be a F4 in a F2 bobbin? If so, why is the other one's resistance also low? Am I measuring wrong? Any ideas or thoughts about any of this?
 

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Pickup resistance varies ever so slightly, even if you're winding to a particular spec; you can have the same number of turns on the bobbins and wind pattern, but the resistance may come out to vary a bit. Here's an old thread where someone is discussing a similar topic: https://www.jemsite.com/forums/f35/ibzusa-f2-tone-zone-specs-42224.html. Each of the two F2s mentioned has a different resistance reading.

If you look at a non-US catalogue from 1991, the 770DX is spec'd as having an F2 in the neck, so maybe it depended on which marked the guitar was destined for (?).
 

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My recall, late at night after a busy day, is that the RG770DX was specced with double F2s for the first year and then when it went to direct mounted pickups instead of guard mounted, it went to an F4 and an F2.
 

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Discussion Starter #4
Thanks for the info. My 770dx is definitely from the 1st year because the pickups are mounted on the pickguard. That explains to two F2s. I'm currently restoring it to it's original specs so this also explains why it has been impossible to find a RG770dx pickguard that is cut for mounting pickups. The only pickguards I can find are cut for pickups that mount to the body. Any ideas where I can find a pickguard that is correct for my guitar? I have had this guitar for 30 years, I still play it nearly every day.
 

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I would look for one that fits a 550 ;), which will allow you to mount the pups to the guard. Should be able to find some on Reverb or eBay. Alternatively, Pickguard Planet has them for 770s specifically, offering guard and direct mount variants.
 
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