By Aurelia Beaty. Guitar Electric. Published at Friday, August 31st, 2018 - 06:50:21 AM.
Another thing to consider is the location in the amplifier of the preamp tube you are replacing. The preamp tube that is located the furthest away from the power tubes will generally have the greatest effect on the tone of the amp; and the preamp tubes that are closer to the power tubes will have the least effect on the tone. So you could put a premium Tung Sol or Mullard in V1, but then a less expensive JJ or a Chinese tube might make more sense in V2. Even if you find a long plate too noisy for any of those positions, a long plate tube might still make a good phase inverter tube for the V3 position (or whichever position is closest to the power tubes).
The magnetic picks tend to be broken into two categories: The single coil pickup, and the double coil or humbucking pickup. Magnetic pickups gain their magnetic fields most commonly from two styles of magnets. There are pickups that will have a magnet that is a rod that will be attached to the base of the pickup, while other pickups achieve magnetism from pole pieces. Pole pieces are magnetic cylinders that come out of the pick and in some pickups adjustments can be made to strengthen the sound of the string.
Because the strings of a guitar are close together, and the pickups use magnetic vibrations, there is a natural tendency for these magnetic pickups to detect and pickup electromagnetic signals from other nearby sources - anything from nearby microphones, to other electric equipment in the area - even lighting. This extra noise is generally not overly distracting, but does tend to create a kind of background hum. Single coil pickups tend to create the most amount of background hum, and the fact that most electric guitars tend to be incorrectly shielded against any interference of this kind, this can be quite unwanted.
There are a number of pickups marketed as single coils that don't hum, including Fender's Vintage Noiseless pickups and Lace Sensor's "Holy Grail" pickups. For the most part, those types of pickups are actually tiny, bright sounding humbuckers. They are made to look like single coils by stacking the two coils on top of each other, instead of laying them side by side. No matter what anyone tells you the only thing that really sounds like a single coil pickup is a single coil pickup.
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