FDP Forum / SSS Strat noiseless in 4th position only, what the heck?/ 12 messages in thread.

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Viera

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Santee CA

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Sep 26th, 2017 07:15 PM        

My recently acquired 1997 hardtail Strat with original pups (Iâm almost certain) is doing a strange thing, in a good way (I think). <br /> <br /> It has normal 60 cycle hum in all positions except the middle/neck pup position. Itâs noiseless in that position, I mean dead quiet. What gives?<br /> <br /> Iâm thinking that perhaps the neck pup might somehow be RWRP relative to the middle pup. Then again Iâm hopelessly inept when it comes to most things electricity/electronics, so Iâm probably wrong.<br /> <br /> Opinions welcome, thanks.<br />



Peegoo

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Deus

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Sep 26th, 2017 07:38 PM        

Best thing to do is pop the hood and look a the color codes for the pickup leads. I'm guessing the bridge pickup may be wired backwards, but there are several reasons why it's acting goofy.<br /> <br /> Also check for continuity across the jack plate and the bridge plate. If there is none--that may be a contributing reason.



Viera

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Sep 26th, 2017 08:20 PM        

Thanks Peegoo. I'll "pop the hood" next time I'm futzing with guitar maintenance/upkeep. <br /> <br /> If the bridge pup is wired backwards could it be that the middle pup might be RWRP?



Hammond101

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Sep 26th, 2017 09:34 PM        

It is also possible that the RWRP PU was installed in the neck position so you only get noise cancelling with the bridge middle.<br /> <br /> You might also want to do the mini screwdriver test and check each PU by tapping on it and the other three to make sure the switch is correctly wired.



Viera

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Santee CA

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Sep 26th, 2017 09:45 PM        

Will do Hammond101. <br /> <br /> This really isn't a problem per se, unless it's a predecessor to other issues. For now I'm just looking to know what's going on. If in fact the neck is RWRP I might just mod the Strat to enable the bridge/neck combo; which theoretically could also be hum cancelling?



Te 52



Laws of Physics

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Sep 26th, 2017 09:54 PM        

Another possibility is that one of the pickups might not be in its correct position.<br /> <br /> If you have a compass, put the guitar in a vertical position, and hold the compass near each pickup. The compass needle should either swing to N or S. That will tell you the 'P' (magnetic polarity) part of the equation. For hum cancellation in positions 2 and 4 you need two norths and one south, or two souths and one north, the odd pickup being in the middle position. Then it's just a matter of putting each pickup in the correct position and wiring them all correctly (the 'W' part of the equation).<br /> <br /> If you don't have a compass but do have a spare pickup, hold that pickup face to face with each of the pickups in the guitar and note if the pickups attract or repel each other. Don't let them crash into each other, though, that can damage alnico magnets.



Hammond101

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Sep 27th, 2017 10:22 AM        

Te 52, Yep, that's what I was getting at early in my post. The RWRP may be installed in the neck. The compass test is a good idea.



SonicBlue



Sunbury-on-Thames

Sep 27th, 2017 10:28 AM        

What's the volume level like in position 2 compared to 4?



Viera

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Sep 27th, 2017 08:09 PM        

Ok, I did the spare pickup test per Te 52. The bridge & neck repel. The middle attracts. I guess that means that the middle is RWRP and that the bridge might be wired backwards per Peegoo? <br /> <br /> SonicBlue: There is no discernible difference in the 2 & 4 position volumes. Thanks for bringing that up.



SonicBlue



Sunbury-on-Thames

Sep 28th, 2017 04:15 AM        

There's an easy way to check if you have or can borrow an analogue multimeter, one with a pointer.<br /> <br /> Set the meter to DC Volts on its lowest, most sensitive range.<br /> <br /> Plug a lead into the guitar and connect the meter leads to the other end, sleeve and tip. It doesn't matter which way round.<br /> <br /> Select position 5, the neck pickup. This will be your reference.<br /> <br /> Place a screwdriver over the neck p/u, across the strings in line with the polepieces.<br /> <br /> Watching the meter, move the screwdriver sharply upwards, away from the strings.<br /> <br /> Note which direction the needle kicks.<br /> <br /> Repeat for the middle (position 3) then bridge (position 1) pickups. They should each move the pointer in the same direction as position 5.<br /> <br /> If one doesn't it's wired backwards. If both middle and bridge move in the opposite direction to the neck, it's the neck that needs rewiring!



Te 52



Laws of Physics

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Sep 28th, 2017 01:15 PM        

"...The bridge & neck repel. The middle attracts. I guess that means that the middle is RWRP..."<br /> <br /> Not quite. It means that the middle pickup is RP (reverse polarity) but doesn't answer the RW (reverse wound) part. But SonicBlue's test will answer that question.<br /> <br /> However, something still doesn't quite add up. Everything I've read so far about your guitar's humbucking performance suggests that you have a proper set of RWRP pickups mounted in their correct positions but with the wires to the bridge pickup swapped, *except*: If all the above is correct, position 2 (M+B) should not only be non-humbucking, it should also be out of phase, producing a weak, thin, "tinny" sound. But you haven't described that position as such.<br /> <br /> So I'm still a bit puzzled... ?8-<br />



Viera

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Sep 28th, 2017 07:18 PM        

Thanks for the additional info SonicBlue. I'll see if I can get my hands on a meter. <br /> <br /> Te 52: I won't have time to do any playing for a day or 2, but I'll report back regarding whether the M+B sound out of phase. Thanks.



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