Although attaching great importance to its development programs, Marshall are not in the business of planned obsolescence, and are acutely aware of their reputation for longevity, in both product and model range. Thus, despite the success of recently developed equipment, the original Marshall amplifiers are still available and are as popular as ever. Below are descriptions and diagrams of these amplifiers.  
 
 
 

 
 

These two amplifiers have undergone a major re-design programme to keep abreast of the requirements of modern bass playing trends. The amplifiers feature two mixable inputs with volume control, active treble and bass controls and a middle circuitry sweepable from 400 HZ to 1 KHZ, plus a slope control that filters the low fundamental notes for that tight punchy sound when playing loud. All this, plus an improvement of bass in the power amp, leads Marshall to believe that the 1992 is the finest 100 watt bass amplifier that they have ever produced.

  
This is the panel of the classic Marshall amps, so much favoured and featured by some of the world's greatest guitarists and bands. There are two models with this format:- model 1987 standard lead 50 watt, the original and legendary Marshall amplifier with its unique sweet overdriven valve sound and sustain, and model 1959 standard lead, with that incomparable 100 watt raunch. Both amps feature the same controls and twin channels, one channel is normal (input II) and the other has a high treble response. Each channel has its own volume control and is mixed into the tone network of treble, middle, bass and presence controls. Variable mains and output selectors enable both amps to be used around the world, with virtually any speaker system.
The amps were developed out of the original Marshall circuitry to enable the musician to reproduce the classic Marshall overdrive sound at any volume level. By varying the pre-amp volume, and master volume controls the sound can be varied from a clean crisp sound to a rich overdrive sound at a controllable volume. As with the standard amps, the master volume series have twin inputs, one having greatly increased gain. Both channels mix into the usual Marshall tone circuitry of treble, middle, bass and presence control. This is an exceedingly versatile amp, and perfect for the discerning guitarist.
The panels of the very latest Marshall heads, as described on the preceding page, show the vast range of facillties offered by these, the most versatile of the Marshall ampilfier range.