Hello and welcome to this week's article!
Today we're going to clarify a bit what are the characteristics of the old school guitar distortion and the modern day hi-gain tone.
Let's start from the base: a distortion is an effect achieved by taking a signal and boosting it on purpose in order to make it become degraded, but in a controlled, euphonic way, with the aim of making it sound more aggressive and compressed, and this is exactly how it went initially; guitarists were plugging their guitars into tube amps and cranking them to the maximum (also because at the early stages there wasn't even what we might call today a p.a.), and the amps just couldn't handle it, so distortion was an unexpected (but usually welcomed) side effect.
Then Hendrix and rock n'roll in general exploded, guitarists were experimenting with their tone like crazy and pushing the boundaries with every record, and the amp producers simply adapted to the needs, creating amps (and pedals) capable of distorting on purpose without the need of putting everyting on 10.
Back in the day of the first hi-gain amps, distortion was permeating the whole frequency range, because it was generated both by the gain stages of the preamplifier and from the power amp, stressing its power tubes, and a good example of the early amps which featured a high-gain tone were the Marshall and the Orange amps of the '70s among the others.
An Orange amp is a good example of old school distortion: it's prominent in the low-mids, which makes it a bit dark sounding, and it's very distorted in that same area, making the tone not very defined and not easy to control, but very punchy for example with groovy single string riffs, like many Led Zeppelin ones, in which every note hits you like a truck.
Modern guitar distortion instead is all about control. This is obtained from amps which through the years had more and more gain stages and which relied less and less on the power amp to distort, until we arrived to amps with large tube power amps (e.g. 120w), with 6L6 power tubes which have a lot of headroom, and all this is to make the power amp sound clean and the amp to rely mostly on the preamplifier for its gain.
This different setup has 2 objectives: 1) to stress less the power amp, thus prolonging the life of the tubes 2) to have a cleaner, tighter low end.
To make the distorted sound even tighter, guitarists like to take a hi-gain head (for example a Mesa Boogie or a Peavey 5150), use the distorted channel and boost it with an overdrive, because it makes the input signal even hotter and the result is a tone with a fast attack, reduced low-mids and a tighter low-end (meaning that when playing a fast, palm muted riff the recoil of the lows is faster and less prominent, so you can hear the riff more clearly).
This solution is particularly good with low tunings (to be honest today it's very hard to even find a band that plays contemporary hard rock-heavy metal in E), because it adds clarity, so in conclusion the modern distortion is about a tight, controlled low-end (which needs to sound clean, because if it's too distorted the riff will sound like a mess, to the point that some metal amp has a separate gain knob for the lows and one for the highs) and a screaming, very defined upper mid range, with a clear attack and good string separation, if you want to play some articulate djenty riff like those of Periphery.
Clearly I have provided the example of 2 very different type of tones and there are surely a million tones in between the old school and the modern one, but I felt like explaining this difference, because it can help defining more the type of sound we have in mind.
Which one among the 2 do you prefer?
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