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13) Treble Control

Controls the upper or treble frequencies in the tone of the Overdrive channel.

Please Note

The Tone Controls are interactive and adjusting one can effect the relative amounts of the others. Experimentation is the best way of finding your own personal favourites.

correct type and rating. It is a wise precaution to always carry spares.

2) Mains Input

Connects the amplifier to the mains power supply.

3) Parallel FX Loop Return Jack

Jack socket for connection from the output of an external effects processor.

14) Parallel Effects Mix Control

Governs the amount of effected signal in the overall tone when used in conjunction with external effects through the parallel loop (see items 3 and 4 of the JCM 600 rear panel functions).

15) Clean Reverb

Controls the amount of Reverb on the Clean channel.

16) Overdrive Reverb

Controls the amount of Reverb on the Overdrive channel.

17) Volume

Controls the overall volume of the combo.

Please Note

A parallel FX Loop is best suited for use with external effects processors which require a certain amount of dry or uneffected signal in the overall tone. Time based effects such as Delay and Chorus are typical examples of the effects best suited to this type of Loop.

4) Parallel FX Loop Send Jack

Jack socket for connection to the input of an external effects processor.

5) Series FX Loop Return Jack

Jack socket for connection to the output of an external effects processor.

6) Series FX Loop Send Jack

18) Standby Switch

Controls the H.T. supply to the valves and allows the valves to remain heated when not in use.

19) Power Switch

On / Off Switch for mains power to the amplifier.

Please Note

To prolong the life of the valves it is always advisable to switch on the Mains Power Switch (item 19) about 2 minutes before switching on the Standby (item 18).

This allows the valves to heat up to full working temperature before use. On switching off, the Standby should always be switched before the Power Switch.

JCM 601, 602 & JCM600 Head

RearPanelFunctions

1) Mains Fuse

Jack socket for connection to the input of an external effects processor.

Note: The Series Loop is best suited to effects that require no dry signal such as Compressors or Graphic Equalisers.

7) D.I. Output

The JCM 600’s D.I. Out is switchable between a speaker Emulated signal (pre the power amp), and a non Emulated (post the power amp ) signal.

The Emulated Output captures the tonality of Vintage loudspeakers like no other D.I. furthermore this output is unaffected by the Master Volume controls therefore allowing the JCM 600’s output to be turned off whilst still providing silent recording facilities.

The D.I. Output is via an XLR type connector which allows this system to be run into either

(a)a line level balanced input (b) a line level unbalanced input or (c) a low level unbalanced input.

Please Note

Refer to the JCM 600 XLR Out diagrams (Below) for correct connections.

Protects the amplifier and mains supply in the

✪ 8) Pre/Post Switch

event of a fault.

Allows Line Out selection between a speaker

 

Check the label on the back of the amp for the

Emulated signal (pre the power amp) and

correct value. Always replace fuses with the

non-emulated (post the power amp).

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Marshall Amplification JCM600 manual Rear Panel Functions
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JCM600 specifications

Marshall Amplification is renowned in the world of music for producing iconic amplifiers that have shaped the sound of rock and roll for decades. One of their standout models is the JCM600, which combines modern technology with classic Marshall tones.

The JCM600 is a versatile tube amplifier designed for guitarists seeking a powerful performance with a variety of tonal options. This amp utilizes Marshall's renowned EL34 power tubes, delivering that signature warm, rich sound that the brand is famous for. With its robust construction and thoughtful engineering, the JCM600 can handle the demands of both studio and live performances.

One of the key features of the JCM600 is its dual-channel design. This allows musicians to switch between clean and overdriven sounds seamlessly. The clean channel maintains clarity and definition, making it ideal for chords and intricate playing. In contrast, the overdrive channel offers a rich, saturated tone that can be adjusted for everything from classic rock rhythms to higher gain sounds that suit heavier genres.

The amplifier includes a range of tonal shaping options. The presence and resonance controls allow players to fine-tune the high and low frequencies, respectively. Additionally, the JCM600 is designed with a three-band EQ—bass, middle, and treble—enabling musicians to sculpt their tone to perfection. This level of control makes it a favorite among guitarists who are particular about their sound.

The JCM600 also integrates modern technology with features such as a built-in digital reverb, adding depth to the overall tone. This reverb can be adjusted to suit the player's preference, whether they desire a subtle ambiance or a more pronounced effect.

Moreover, the amplifier is built with durability in mind, featuring a rugged chassis and high-quality components meant to endure the rigors of touring musicians. The cooling system is engineered to prevent overheating, ensuring reliable performance in even the most demanding environments.

In essence, the Marshall JCM600 encapsulates what guitarists have come to expect from the brand: powerful performance, incredible tonal versatility, and robust durability. Whether on stage or in the studio, this amplifier ensures that musicians can express their creativity and achieve their desired sound with ease.
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