Marshall Amplification EL84 20/20 manual Specification Chart, Channel a output impedance select

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7. Channel B output impedance select 16 Ohm or

8 Ohm - it is important that your amplifier and loudspeaker load are correctly matched.

Note! If 4 Ohm output is desired please consult your authorised Marshall agent.

8. Channel A output impedance select

(See 7 for notes).

9. Channel A loudspeaker jacks (See 6 for notes). 10,11. Remote voicing switching jacks

10 operates on channel B, 11 operates on channel A. Short to ground function. Using jack 11 only links channel A & B switching functions for simultaneous use.

12. Channel B link out jack Connects channel B input signal to further power amp inputs.

13.Channel B input jack Accepts input from pre- amp.

14.Channel A input jack Accepts input from pre- amp.

Note! Using 14 only connects input signal to both channels A & B for parallel mono operation.

15. Channel A link out jack Connects channel A input signal to further power amp inputs.

Valve Location Guide

Rear Mounting Fixing Hole

 

Rear Mounting Fixing Hole

 

 

 

Not Fitted To EL34 50/50

 

OUTPUT

 

 

OUTPUT

TRANSFORMER

 

 

TRANSFORMER

EL34

EL34

EL34

EL34

EL34

EL34

EL34

EL34

MAINS

 

 

MAINS

TRANSFORMER

 

 

TRANSFORMER

ECC81

ECC83

ECC83

ECC81

12AT7

12AX7

12AX7

12AT7

 

FRONT

 

ENGLISH

Specification Chart

Parameter

EL34 50/50

EL34 100/100

Notes

 

 

 

 

 

 

Size

19" 3U x 331mm deep

19" 3U x 331mm deep

The unit must be supported at

 

 

 

 

the rear when mounted in a rack

 

 

 

 

 

 

Weight

29.5 kg

34.5 kg

 

 

 

 

 

 

 

Power input

350 watts

700 watts

 

 

 

 

 

 

 

Voltage Input

115V or 230V

115V or 230V

Consult amp rating plate or dealer

 

 

 

 

 

 

Frequency

50 or 60 Hz

50 or 60 Hz

Consult amp rating plate or dealer

 

 

 

 

 

 

Mains fuses

T3.15A/115V

T4A/115V

Per channel

 

 

 

 

 

 

 

T1.6A/230V

T2A/230V

Per channel

 

 

 

 

 

 

H.T. Fuses

T315 mA

T1A

Per channel

 

 

 

 

 

 

Output Power

50W RMS

100W RMS

At clipping (per channel)

 

 

 

 

 

 

Output Impedance

8 or 16 Ohm*

8 or 16 Ohm*

Consult dealer for 4 Ohm

 

 

 

 

 

 

Input sensitivity

OdB

OdB

 

 

 

 

 

 

 

Input impedance

20K

20K

 

 

 

 

 

 

 

Output valve

2 x EL34

4 x EL34

Per channel

 

 

 

 

 

 

Phase inverter

1 x ECC81/12 AT7

1 x ECC81/12 AT7

Per channel

 

 

 

 

 

 

Pre Driver

1 x ECC83/12 AX7

1 x ECC83/12 AX7

Per channel

 

 

 

 

 

 

6

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Contents Valve Power Amps From Jim Marshall EL84 20/20 Mounting the Power Amp in a RackIntroduction EL34 50/50 & EL34 100/100EL84 20/20 Front Panel Features EL84 20/20 Rear Panel FeaturesChannel a mains power rocker switch EL34 50/50 & EL35 100/100 Front Panel FeaturesRear Panel Features Mains & standby LEDsSpecification Chart Channel a output impedance select

EL84 20/20 specifications

Marshall Amplification has built a legacy of producing some of the most sought-after guitar amplifiers in the market, merging classic sound with innovative technology. The Marshall EL84 20/20 stands out as a remarkable offering, aimed at musicians who crave versatility without compromising on tone.

At the heart of the EL84 20/20 are two EL84 power tubes, which deliver 20 watts per channel of rich, dynamic sound. This choice of tubes contributes to a warm and distinctive tonal character, providing that quintessential Marshall crunch favored by many rock and blues guitarists. The amp features two independent channels, allowing players to switch between a clean and overdriven sound effortlessly. Channel one offers a pristine clean tone, while channel two lets players unleash the full fury of Marshall’s legendary overdrive.

One of the notable features of the EL84 20/20 is its innovative power scaling technology. This allows guitarists to control the wattage output, enabling them to achieve optimal sound at any volume level. This feature is particularly beneficial for studio recordings and small venue performances as it allows musicians to push the amp to its sweet spot without overwhelming their surroundings.

Another highlight is the built-in reverb, adding depth and ambiance to the sound. This is particularly useful for live performances, where atmospheric effects can elevate the overall experience. Players can dial in their desired reverb level to complement their tone, making it a valuable addition to the amp's versatility.

The EL84 20/20 is designed with a user-friendly interface, featuring straightforward controls that include gain, treble, middle, bass, and reverb for each channel. This intuitive layout makes it easy for musicians to customize their sound and dial in their ideal tone quickly, whether in the studio or on stage.

In terms of connectivity, this amplifier offers a range of outputs, including speaker outputs that allow for different cabinet configurations, as well as an effects loop for integrating external effects pedals. This flexibility caters to a wide array of performance styles and playing environments.

In summary, the Marshall EL84 20/20 combines classic Marshall tone with modern technology, making it an ideal choice for any guitarist seeking a powerful yet versatile amp. Its signature features, such as the EL84 power tubes, power scaling, reverb, and intuitive controls, ensure that musicians can achieve their desired sound with ease and precision, solidifying its position as a must-have in the world of guitar amplification.