Manual de jcm900

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  • Publicado : 9 de febrero de 2012
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SL-X 2100
& &

SL-X 2500

Master Volume Models

4100, 4500, 4101, 4102, 4501 & 4502
Dual Reverb Models
Marshall Amplification plc Denbigh Road, Bletchley, Milton Keynes, MK1 1DQ, England Tel: (01908) 375411 Fax: (01908) 376118 Web Site -
Whilst the information contained herein is correct at the time of publication, due to our policy of constantimprovement and development, Marshall Amplification plc reserve the right to alter specifications without prior notice. Nov ‘98



PLEASE READ THE FOLLOWING LIST CAREFULLY A. ALWAYS fit a good quality mains plug conforming to the latest B.S.I. standards (UK only). B. ALWAYS wire the plug in accordance with the colour code attached to the mains lead (UK only). C.DO NOT attempt to remove the amplifier chassis. There are no user serviceable parts inside. D. ALWAYS have this equipment serviced or repaired by competent, qualified personnel. E. NEVER under any circumstances, operate the amplifier without an earth. F. NEVER use any amplifier in damp or wet conditions. G. ALWAYS ensure that the impedance of the amplifiers speaker or speakers connected does notfall below the minimum impedance rating. I. PLEASE READ this instruction manual carefully before switching on.

JCM 900

Marshall have specialised in the production of valve amplification since 1962. The unique tone and playing response of the valve has formed the cornerstone of the Marshall “Sound of Rock”, which we have modified over the years to cope with the changing demandsof the evolving guitar player. The JCM 900 models split into two distinct product ranges, the Master Volume SL-X and the Dual Reverb. Though they share common ancestry and have similar rear panel functions their applications are quite different.


The latest innovation from our valve designers involves the use of an extra ECC83 pre-amp valve in the gain stage ofthe Master Volume SL-X models. This gives a gain soaked front end that is the most extreme yet produced by Marshall and is controlled by twin gain controls, the first (item 2), from 0-10, the second (item 3), from 10-20! Combinations of these two controls can take you from classic Marshall crunch in lower positions, to pure overdriven outrage on maximum. It is well worth experimenting with thesetwin gains in conjunction with the tone network (items 6-9) to really get to know the full capability of your new SL-X head. The twin Master Volumes (items 4 & 5) are another unique feature of the SL-X amp giving you two footswitchable output volume levels, ideal for rhythm to solo switching. Although a clean sound is available, this amp was designed for the uncompromising high gain player whodemands a no compromise sound.

The Dual Reverb range was designed for versatility with two independently controlled footswitchable channels, each voiced totally differently. Channel A is voiced for brilliant clean tones with the gain control (item 2) on lower settings and crunch to lower gain lead as you turn it up. Channel B is boosted with enough gain (item 3), for fearsomelead tones, ranging from classic on lower settings to contemporary screaming solos on maximum. Channel master volumes (items 9 & 11) and individual channel reverb controls (items 8 & 10) give you incredible control and all round versatility in either, head or combo form.

The JCM 900 range use high quality 5881 output valves (x2 in 50 Watt models, x4 in 100 Watt models) fortheir unique distortion properties and fluid tone. With most valve amplifiers, particularly Marshalls', the best sounds are achieved when the Master Volumes are set high enough to be utilising the driving power of the output valves to the full. This delicate working balance between the pre-amp and power amp levels can only be achieved by experimentation. You will find that all the JCM 900 models...
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