Something I probably should know but don't.

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NYGeorge
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Something I probably should know but don't.

Unread post by NYGeorge » Fri Jan 25, 2019 12:50 am

I have the set of SG 700 pups that I am going to put in my 175. One is 8.3 and one 1 is 8.6. Instinct tells me the higher impedance means more winds and hotter pup which means bridge but am not sure. Help.
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Mimasu
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Re: Something I probably should know but don't.

Unread post by Mimasu » Fri Jan 25, 2019 2:49 pm

Your instinct is right. If all else like type of wire, type of magnet etc. is the same the higher impedance is the hotter PU. I have had some older sets of PU's and there wasn't a difference in impedance so neck and bridge PU were identical. Also nowadays many manufacturers of humbuckers don't have different PU's for neck and bridge. Did Yamaha have?

Leon
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Les Turnbull
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Re: Something I probably should know but don't.

Unread post by Les Turnbull » Fri Jan 25, 2019 3:01 pm

As you say the higher resistance pup should be the bridge but I have noticed from previous posts that the older pickups have 3 felt pen dots on the back . viewtopic.php?f=142&t=10371&start=15 Triangle shaped dods seem to mean bridge and inline dots neck pup but its not always that simple .
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Les Turnbull
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Re: Something I probably should know but don't.

Unread post by Les Turnbull » Fri Jan 25, 2019 3:40 pm

Some pickups can have narrower pole piece spacing at the neck pup than at the bridge pup , This is true of Gibson pups as the tin covers can not be swapped from one pup to another due to different hole spacing .

Edit
Just measured my 1983 SBG 500 pups and and get 12.3 k humbucking and 6.2 k tapped on both pups and the pole spacings are exactly the same also the felt pen dots on the back are the same so im thinking my 2 pups are identical .
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Last edited by Les Turnbull on Fri Jan 25, 2019 5:03 pm, edited 3 times in total.
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Mimasu
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Re: Something I probably should know but don't.

Unread post by Mimasu » Fri Jan 25, 2019 3:59 pm

Les Turnbull wrote:
Fri Jan 25, 2019 3:01 pm
As you say the higher resistance pup should be the bridge but I have noticed from previous posts that the older pickups have 3 felt pen dots on the back . viewtopic.php?f=142&t=10371&start=15 Triangle shaped dods seem to mean bridge and inline dots neck pup but its not always that simple .
Saw that one passing by too. Don't know if there is any system in that. Since some time I take out the PU's when changing strings on my vintage Yamaha's and take a pic. Seen a lot of PU's that way, SG's, SA's, LP's, SL's and SF's. Only one had dots. 3 dots in triangle shape, but as a bridge PU 8-) .
NYGeorge wrote:
Fri Jan 25, 2019 12:50 am
I have the set of SG 700 pups that I am going to put in my 175. One is 8.3 and one 1 is 8.6.
My 77/78 SG700 has PU's reading 8.56 and 8.58 k. So no relevant difference.

Leon
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NYGeorge
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Re: Something I probably should know but don't.

Unread post by NYGeorge » Fri Jan 25, 2019 6:31 pm

Many thanks for the input.
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Mimasu
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Re: Something I probably should know but don't.

Unread post by Mimasu » Fri Jan 25, 2019 7:12 pm

NYGeorge wrote:
Fri Jan 25, 2019 6:31 pm
Many thanks for the input.
Sh#t, I thought it was all about the output......... Sorry :( .

Leon
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Re: Something I probably should know but don't.

Unread post by baaron31 » Mon Feb 11, 2019 7:55 pm

I just got myself a fine example of an SG90. The humbuckers are marked as SG90 on the back. I will measure the resistance when i get the chance and let you know.
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NYGeorge
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Re: Something I probably should know but don't.

Unread post by NYGeorge » Tue Feb 12, 2019 4:09 am

That would be good info but pictures would be even better.
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Re: Something I probably should know but don't.

Unread post by baaron31 » Sat Feb 16, 2019 2:50 am

Here are some pictures. Guitar came with some hazy patches on finish but with some advice from NYGeorge I managed to get it off and now guitar looks mint! Still haven't got around to measure humbucker resistance yet but hopefully i ll get to it soon.
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Les Turnbull
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Re: Something I probably should know but don't.

Unread post by Les Turnbull » Sat Feb 16, 2019 9:12 pm

44 years old and the finish still looks usual top notch from Yamaha . Unusual to see the serial number on the fret board .
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Re: Something I probably should know but don't.

Unread post by baaron31 » Fri Mar 08, 2019 6:27 pm

What I am mostly impressed with, is the condition of the hardware including the electronics. I have customshop Gibsons and high end PRS's that are a lot newer but already have lots of wear and corrosion on the chromed parts! Really blown away on how well built this guitar is. The chromed parts look brand new and pots and wiring seems like it was done very recent despite being original.
Anyone can tell if this is a 74 or a 75? Seems like from the "50" on the back of the pickups that this is a 75. Is one correct to assume this is the 50th year of Emperor Hirohito?
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Les Turnbull
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Re: Something I probably should know but don't.

Unread post by Les Turnbull » Sat Mar 09, 2019 3:09 pm

Yes 50th year of Emperor Hirohito . 18 January 1975 so it is possible that some of the parts on that guitar were manufactured in late 1974 .
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