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Why are multiple power tubes used in guitar amplifiers?
I'm not an engineer, so can someone explain why you would design an amp with multiple tubes... what does this give you in terms of power, volume, or tone control? I've read about tubes being paired or matched, and I would guess pairs work in series then.
Thanks.
Tubes and transistors have power ratings (maximum operating power). These devices can be made to operate at higher power than an individual tube rating by connecting tubes in parallel.
Depending on the type and class of the tube output state, two tubes may be connected in a "push-pull" circuit configuration; thus, requiring two tubes. There may be pre-amp or driver tubes before the output stage.
Beyond gaining higher output power (louder sound) by paralleling tubes, I don't think the arrangement will add anything more to tone are overall frequency response---depends on how the circuit is designed, of course.
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