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Marshall 1974X
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Marshall 1974X


Marshall 1974X

Marshall 1974X Overview:

Tone and Tech Talk The 1974X is an all-valve, 18 Watt, two-channel, 1x12" combo with valve driven tremolo and no negative feedback in its cathode-biased output stage. When building this handwired re-issue our goal was both obvious and simple: to make it as close as possible to the original.

As Jim has already pointed out, we went to incredible lengths to achieve maximum authenticity in terms of components, circuitry, constructional methods, materials, specifications, aesthetics, signal path, performance, tonal characteristics and feel. We are delighted to report that our suppliers were equally as exacting in their tasks none more so than Dagnall Transformers and Celestion Speakers.

As you can see from its top panel layout, the 1974X is an extremely straightforward amplifier. Channel 1 (the non-tremolo channel) only boasts two, self-explanatory controls: Volume and Tone; while Channel 2, the Tremolo Channel, boasts four namely Volume and Tone, plus Speed and Intensity for the valve driven tremolo circuit.

Like all Marshall valve amplifiers, the 1974X sounds truly majestic when turned up full and because of its relatively low wattage this can be done at ear friendly volumes, making it a wonderful recording tool. In keeping with bigger, non-master-volume, all-valve, Marshall amplifiers such as the 1962 'Bluesbreaker' combo and the legendary 100 Watt 'Plexi' head, the 1974X's sweetly distorted, harmonically rich, thick, musical tones result from the power valves being overdriven. Our proprietary, re-issued and 'aged' 20 Watt Celestion speaker contributes to the combo's unique, punchy yet smooth sound as well. As a result, when 'cranked' the 1974X is incredibly touch-sensitive, cleaning up or, if desired, sitting right on the edge of distortion when the guitar's volume is turned down. It responds well to picking dynamics too, 'sagging' nicely when you play like you really mean it and, once again, cleaning up as you pull back on your picking attack.

There now follows some information regarding the inner workings and build of the 1974X. Valve complement: Three ECC83s (12AX7s) in the pre-amp, a EZ81 rectifier and a pair of EL84 power valves working in push-pull. All valves are of the highest quality available and go through a meticulous grading and testing process.

The way the three ECC83s (V1, V2 & V3) in the pre-amp are utilised is as follows: V1 is dedicated to Channel 1, the non-tremolo channel. As Channel 1's pre-amp has a single gain stage, each half of the valve (the ECC83 being a dual-triode) acts as a dedicated gain stage for the channel's two inputs (which are identical). V2 acts as the amplifier's phase-splitter. V3 is dedicated to Channel 2, the Tremolo channel. To be precise, one half of the ECC83 acts as the single pre-amp gain stage for the channel's two inputs (High and Low) while the other half acts as the oscillator for the amp's tremolo circuit.

Due to the fact that the EZ81 rectifier valve and also the pair of EL84 output valves attain extremely high temperatures when the amplifier is in use, their bases are made from the highest grade ceramic available.

Marshall 1974X Top Panel Features:


This filament bulb indicator will light up when your amplifier is switched on. It will not be lit when the amplifier is switched off and/or is not receiving mains power.


The Standby Switch is used in conjunction with the Power Switch (item 3) to 'warm up' the amplifier before use and to prolong the life of the output valves.

When powering up the amplifier always engage the Power Switch first, leaving the Standby switch on 'Standby'. This allows the application of the voltage required to heat the valves to their correct operating temperature hence the switch's name. After approximately two minutes the valves will have reached the correct operating temperature and the Standby Switch can be engaged. Upon doing this the H.T. (High Tension) voltage required by the two EL84 output valves to pass signal (and hence produce sound) is applied. In order to prolong valve life, the Standby Switch alone should also be used to turn the amplifier 'on' and 'off' during breaks in a performance. Also, upon full power down, always disengage the Standby Switch prior to the main Power Switch.


This is the On/Off switch for mains power to the amplifier. Note: Please ensure the amplifier is switched off and unplugged from the mains electricity supply whenever it is moved.


This controls the speed of tremolo oscillation when this effect (which can be switched on/off via the supplied footswitch) is being used. Oscillation speed increases when the Speed control is turned clockwise and decreases when it is turned anticlockwise.


This controls the intensity or depth of the tremolo oscillation when the effect is being used. The effect depth increases when the Intensity control is turned clockwise and decreases when it is turned anticlockwise.


This adjusts the tonal character of the Tremolo Channel. Turning this control clockwise increases the amount of high frequencies (treble) present in the sound.


This controls the volume of the Tremolo Channel. Turning it clockwise increases the volume level of the channel.