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Related Manuals for Marshall Amplification JCM 900 valve series
Summary of Contents for Marshall Amplification JCM 900 valve series
- Page 1 SL-X MASTER VOLUME & DUAL REVERB HANDBOOK...
- Page 2 FROM THE CHAIRMAN I would like to thank you personally for selecting one of our new Marshall JCM 900 valve amplifiers. For over three decades my company has been dedicated to the design and manufacture of the finest amplification systems in the world.
- Page 3 WARNING! 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.
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Page 4: Front Panel Functions
HI GAIN MASTER VOLUME SL-X The latest innovation from our valve designers involves the use of an extra ECC83 pre-amp valve in the gain stage of the 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. - Page 5 NOTE: Combinations of the two gain controls (items 2 and 3) provide a wide range of clean, crunch and overdrive possibilities. Experimentation will reveal the optimum settings for each. 4 & 5. Master Volume “A” Master Volume “B” Twin footswitchable Master Volume Controls. Master “B” controls the overall volume exclusively when a footswitch is not connected.
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Page 6: Rear Panel Functions
REAR PANEL FUNCTIONS 10. Valve Failure Fuse Operates in the event of an output valve failure and The Hi Gain Master Volume SL-X and Dual prevents any internal damage to the amplifier. Reverb models feature comprehensive connection NOTE: and control facilities on the rear panel which are common to both ranges. -
Page 7: Front/Rear Panel View
JCM 900 SL-X HI GAIN MASTER VOLUME FRONT PANEL 11 10 9 JCM 900 SL-X HI GAIN MASTER VOLUME & DUAL REVERB REAR PANEL NOTE: On Combo models the rear panel is reversed 9 10 11 12 13 HI GAIN DUAL REVERB FRONT PANEL NOTE: On Combo models the front panel is reversed 13 12 11...
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Questions and answers
Hi second attempt to contact you I can’t find my amp in your site! It’s a JCM 900 50 w high gain master volume mk three. Can you send me some info? Thanks Mike
The Marshall JCM 900 50W High Gain Master Volume MK III amplifier is part of the SL-X Master Volume series. It uses two 5881 output valves, providing 50 watts of power. The amplifier has high gain capabilities, especially in Channel B, which offers boosted gain for strong lead tones—from slight overdrive at lower settings to intense distortion at higher settings. Channel A provides clean to crunch tones depending on the gain setting. It includes separate channel master volumes and individual channel reverb controls for versatility. An output mode switch allows switching between high and low power; the low setting uses triode operation, reducing output to 25 watts.
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