What are the magnet strengths of various Fender pickups?
I use several types of magnetometers to measure the magnitude and direction of the magnetic fields in various pickups. I would suggest using a hand model manufactured by the R.B. Annis Company-1101 North Delaware St.-Indianapolis, IN 46202, Phone 317-637-9282. I often use Model 25 with the range of 50-0-50 . Magnets used within pickups can range from very low gauss to above 50 gauss. Early Alnico magnets can be between 15-25 gauss and new Alnico magnets can be 35-50+ gauss. If the magnets are re-magnetized you will notice a difference in the sound and output of the pickup. Making the magnets stronger will brighten the pickup, increase string pull, make the pickup louder and even decrease sustain due to increased string pull. Weaker magnets can make your pickup sound warmer, less output and smoother. Your pickups should be measured before any magnetic calibration is done and if any pickup modification is done make sure you have a qualified repairman do it.
