The only dumb questions are the ones unasked - get them answered and get on with the fun! I'll start with "Tube Rolling" - this refers to the act of swapping different tubes of the same type or compatible types for different sounds. Different brands, vintages, construction styles of tubes sound different from one another and can be used to effect changes in the sound of the component. That is to say, a KT88 from one brand will sound different to varying degrees from a KT88 from another brand, and even from a KT88 from the same brand made at a different time. Some tube types are compatible with one another in certain components - for example, many amps can interchange the EL34, 6550, KT88, KT90 (and less common KT66, KT77) tubes in the same sockets. Each of these tube types has a different "family sound" from one another. The EL34 for example is known for lush midrange, but less bass control. The KT88 has good bass control and good HF extension, but less midrange magic. Tube rolling allows you to experiment with different flavors of sound, and to ultimately dial in your favorites.
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