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Thomann's Cool Online Guides: Guitar Amp Heads

2. History

Guitar amplification has evolved in parallel with the electric guitar itself. The need for amplification arose as dance and swing bands grew louder in the early part of the Twentieth century as more instruments – and more noisy instruments – were added. Though most rhythm sections included a guitar, what was at the time a purely acoustic instrument struggled to be heard above the horns and drums. A single sax or trumpet is considerably louder than an acoustic guitar, so it’s no surprise that as swing bands expanded to include four or five of each, the guitar was restricted to almost subliminal background rhythm work.

From a present-day perspective, it seems a happy accident that guitar amplification was developed before the technological advances that made high fidelity amplification possible. The original design goal was simply to amplify the acoustic guitar’s sound without changing its character, but Fortunately for us, the components available in the Thirties and Forties were simply not up to the job. Early recordings of the electric guitar, though not nearly as far removed from the sound of the acoustic instrument as the rock guitar sounds of later decades, feature a distinctive ‘honking’ sound - the result of a number of factors including slight distortion, compression, and a technically very poor frequency response - the basic components of the rock guitar sound were already in place!

By the mid Sixties, the electric guitar was a well-established instrument, and central to most popular music on both sides of the Atlantic. However, guitar amplification still lagged behind in some respects - the popular bands of the day were playing to large audiences of teenagers, who far from listening in respectful silence, tended to scream hysterically - guitarists were forced to turn their modestly powered amplifiers up to maximum volume…

Any analogue audio circuit will produce distortion if driven hard enough. In hi-fi terms this is considered undesirable - hi-fi amps are often marketed in terms of how little distortion they produce at maximum volume. But as guitar players in the Sixties began to turn their amps up louder and louder, many of them discovered that they actually rather liked the resulting distortion.

The basic component of most electronic equipment until around this time, the thermionic valve (also known as the vacuum tube), would generally soon be superseded by the transistor. Transistors are superior to valves in almost all respects, being far smaller, cheaper and more reliable. The silicon chip, which is an array of thousands or even millions of transistors, is in general better still. But guitar players first encountered distortion at a time when valves still held sway, and certain types of valves beat transistors in one crucial respect - they produce subjectively pleasing distortion. Valves are still used today, because although guitar amp manufacturers were as keen as anyone to switch to transistors, guitarists kept insisting that they just didn’t sound as good when overdriven. To the extent that decent-sounding transistor amps do exist, this is because much work has been done to understand why valves sound so good and to develop ways to mimic them.

Because distortion was initially an unintended consequence of amplifier design, there was no way to achieve it without turning up to deafening levels. Until the late Sixties, guitar amps had only one volume control which controlled the signal level all the way through several stages of amplification. In other words, your sound could be either clean and quiet, or loud and dirty. Obviously this became a problem as the distorted sound’s popularity increased - many players wanted to use distortion on smaller gigs, or at home, without damaging their hearing or irritating their neighbours. Two solutions to this problem arrived at around the same time -the distortion pedal (initially known as the ‘fuzz box’), and the master volume control.

The idea behind the fuzz box was to produce distortion or ‘fuzz’ in an external unit before feeding it to the amplifier. While early fuzz boxes used the new transistor technology, and thus failed to duplicate the sound of valve distortion, they were of course usually connected to valve amps, which smoothed out their sound somewhat, and various classic fuzz box sounds, not all of which sound like a wasp in a jam jar, can be heard on records of this era.

The master volume control, pioneered by Marshall, was more generally useful, the idea being that distortion could be produced at the pre-amplifier stage (where the basic sound is shaped), with a separate volume control at the power amp stage (where the signal is stepped up to a sufficient level to drive a loudspeaker). Almost all guitar amps make use of this concept today, and therefore usually have a gain control (which affects both distortion and volume), and a master volume control governing the overall level.

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Terms and Conditions for participation
in online competitions

Note: Participation in an online competition runs independently from any purchase at Thomann GmbH. The following Competition Rules apply when participating in any online competition run by Musikhaus Thomann:

  1. Competition

    1. The competitions are organised by Thomann GmbH, CEO: Hans Thomann, Hans-Thomann-Straße 1, 96138 Burgebrach, Germany.
  2. Participation

    1. Competitions are only open to persons of full age.
    2. To take part in the competition you must answer all questions correctly, fill in the registration form and submit your entry to Thomann GmbH by pressing the "send" button.
      By pressing the "send" button the participant accepts the aforementioned terms and conditions.
    3. The participant is responsible for entering their email and/or postal address correctly. Entries to the competition will be logged electronically.
  3. Qualifying Entrants

    1. Staff of Thomann GmbH and any cooperation partners and their dependants are excluded from participation.
    2. Should these conditions of participation be violated, especially by using illegitimate means, Thomann GmbH reserves the right to exclude persons from the competition. In case of such violations prizes can be withdrawn and claimed back subsequently.
  4. Announcing the winner

    1. The winners will be notified by Thomann GmbH by email or in writing and their names may be published on the homepage www.thomann.de. The winner accepts this form of publication explicitly.
      Should for whatever reason the winner not claim their prize, then a new winner will be drawn.
    2. The prize presented to the winner may not be identical to the item description. There can be deviances regarding the model, colour etc.
    3. The merchandise prizes will be sent by Thomann GmbH or by one of its contracting delivery companies, per freight forwarder, courier or postal service to the postal address indicated by the winner.

      The delivery is free of charge. Only extra transport costs and customs/duties must be covered by the winner. In the case that the delivery has to be made through a freight forwarding company the freight forwarding company will contact the winner to arrange delivery timings.
    4. An exchange, cash alternative or replacement prize is not possible.
    5. The claim to the prize or replacement of the prize cannot be assigned to a third party.
  5. Data protection

    1. The participant accepts explicitly that Thomann GmbH saves all necessary data for the duration of the competition and forwards them exclusively for purposes related to the winning process to the respective cooperation partner, who is also permitted to save the personal data only for the duration of the competition. The participant is free to withdraw his entry at any time. Please direct the withdrawal to:

      Thomann GmbH
      to the data protection officer
      Hans-Thomann-Straße 1
      96138 Burgebrach, Germany
    2. Thomann GmbH is obliged to consider the regulations for data protection according to the Federal Data Protection Law (BDSG) valid at the conclusion of the competition. In this context the general data protection regulations under notes regarding data protection should be noted.
  6. Liability

    1. Thomann GmbH will be released from any obligations by handing out the prize.
    2. Thomann GmbH is not liable for the insolvency of a cooperation partner and the resulting consequences for the implementation and processing of the competition.
  7. Other

    1. Legal proceedings are barred.
    2. The law of the Federal Republic of Germany applies exclusively.
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Guitar Amp Heads overview


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