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1058| Effects for the Sounds
Tube talk
‘Tubes’ is the name adopted in the USA, while ‘valves’ is the British equivalent. As
all the amps we’ve modelled come from one of the two countries just mentioned,
we will use the corresponding term in the following descriptions.
Also, please note that an ECC83 preamp valve is the British version of a 12AX7
preamp tube used in the USA.
Modelling speaker cabinets
The accurate amp models can be paired with speaker cabinet models of the same
quality. The output stage of a tube amp works in close harmony with the varying
impedance curve of the speaker(s) it is driving. This intimate and vital relation-
ship plays a major role in producing the warm, punchy sound and pleasing feel of
tube amps.
Modelling a speaker cabinet is not just a case of frequency response, but is a
combination of frequency response, transient response (how a speaker reacts
to the strength of how a note is played), and the all-important interaction of the
amps output to the speaker’s impedance curve. In addition, other vitally impor-
tant factors that have to be taken into account when modelling a cabinet are the
actual physical dimensions of the enclosure (cabinet), the unique tonality of said
enclosure (which will be affected by both the type and thickness of the wood it is
made of) and whether it boasts an open, semi-open or closed-back design.
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