SEYMOUR DUNCAN

CUSTOM ALNICO 4 SERIES HUMBUCKERS



SD ALNICO 4 SERIES MAGNET SWAP LIST

- ALNICO 4 polished - - - - - Seymour Duncan '59 Bridge
- ALNICO 4 polished - - - - - Seymour Duncan Custom 5
- ALNICO 4 rough - - - - - Seymour Duncan JB Trembucker
- ALNICO 4 rough - - - - - Seymour Duncan Distortion Trembucker
and. . .
- ALNICO 4 polished - - - - - Seymour Duncan Alnico II Pro Trembucker

I have been intrigued with the Alnico 4 magnet for bridge-position humbuckers - especially since the Seymour Duncan Saturday Night Special came out in 2016. And because there aren't too many of these A4 humbuckers available on the pickup aftermarket, I thought I'd make some of my own based of several of Seymour Duncan's most popular models - the '59 Bridge SH-1b, Custom 5 SH-14, JB TB-4, and Distortion TB-6. I used polished Alnico 4 magnets in the standard-spaced '59 Bridge and Custom 5, and rough (sand cast) A4 magnets in the Trembucker-spaced JB and Distortion. All black and all naturally aged in used condition. The DC Resistance readings for before and after are listed below.

And as a bonus, I even replaced the A2 in a zebra Alnico II Pro Trembucker TB-APH1 with a polished Alnico 4 magnet and kept it looking like new.




SEYMOUR DUNCAN '59 Custom 4 Bridge

Text goes here...

MANUFACTURER
PICKUP MODEL (original)
GUITAR
CIRCA
ORIGINAL MAGNET
NEW MAGNET
ORIGINAL DC RESISTANCE
FINAL DC RESISTANCE
SPACING
NOTE
Seymour Duncan
'59 Bridge SH-1b
TBD
2008
Alnico 5
ALNICO 4 polished
8.23K
8.21K
49.2mm
black (aged); swapped Alnico 5 for Alnico 4
nickel-silver baseplate - long legs - maple spacer





SEYMOUR DUNCAN Custom 4 Custom

Text goes here...

MANUFACTURER
PICKUP MODEL (original)
GUITAR
CIRCA
ORIGINAL MAGNET
NEW MAGNET
ORIGINAL DC RESISTANCE
FINAL DC RESISTANCE
SPACING
NOTE
Seymour Duncan
Custom 5 SH-14
TBD
2018
Alnico 5
ALNICO 4 polished
13.81K
13.77K
49.2mm
black (aged); swapped Alnico 5 for Alnico 4
nickel-silver baseplate - short legs - maple spacer





SEYMOUR DUNCAN JB Custom 4 Trembucker

Text goes here...

MANUFACTURER
PICKUP MODEL (original)
GUITAR
CIRCA
ORIGINAL MAGNET
NEW MAGNET
ORIGINAL DC RESISTANCE
FINAL DC RESISTANCE
SPACING
NOTE
Seymour Duncan
JB Trembucker TB-4
TBD
2013
Alnico 5
ALNICO 4 rough
17.42K
17.38K
52.6mm
black (aged); swapped Alnico 5 for Alnico 4
nickel-silver baseplate - short legs - maple spacer





SEYMOUR DUNCAN Distortion Custom 4 Trembucker

Text goes here...

MANUFACTURER
PICKUP MODEL (original)
GUITAR
CIRCA
ORIGINAL MAGNET
NEW MAGNET
ORIGINAL DC RESISTANCE
FINAL DC RESISTANCE
SPACING
NOTE
Seymour Duncan
Distortion Trembucker TB-6
TBD
2019
Ceramic
ALNICO 4 rough
17.29K
17.25K
52.6mm
black (aged); swapped Ceramic for Alnico 4
nickel-silver baseplate - short legs - maple spacer





SEYMOUR DUNCAN Alnico IV Pro Custom Trembucker

Text goes here...

MANUFACTURER
PICKUP MODEL (original)
GUITAR
CIRCA
ORIGINAL MAGNET
NEW MAGNET
ORIGINAL DC RESISTANCE
FINAL DC RESISTANCE
SPACING
NOTE
Seymour Duncan
Alnico II Pro Trembucker TB-APH1
TBD
2019
Alnico 2
ALNICO 4 polished
8.54K
8.49K
52.6mm
zebra; swapped Alnico 2 for Alnico 4
nickel-silver baseplate - short legs - maple spacer



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