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Marshall 1974X Seite 4

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1. INDICATOR
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.
2. STANDBY SWITCH
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.
3. 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.
CHANNEL 2
THE TREMOLO CHANNEL
4. TREMOLO SPEED CONTROL
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.
5. TREMOLO INTENSITY CONTROL
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.
6. TONE CONTROL
This adjusts the tonal character of the Tremolo
Channel. Turning this control clockwise increases
the amount of high frequencies (treble) present in
the sound.
7. VOLUME CONTROL
This controls the volume of the Tremolo Channel.
Turning it clockwise increases the volume level of
the channel.
8. CHANNEL 2 INPUTS
These are the guitar inputs for the Tremolo
Channel. The top one is the ‘high sensitivity’ input
for this channel, the bottom one is the ‘low
sensitivity’ input which is 6dB lower (i.e. half) than
the ‘high sensitivity’ input and has a darker sound.
Always use a high quality screened guitar lead.
CHANNEL 1
THE NON-TREMOLO CHANNEL
9. TONE CONTROL
This controls the tonal character of Channel 1.
Turning the tone control clockwise increases the
amount of high frequencies (treble) present in the
sound.
10. VOLUME CONTROL
This controls the volume of Channel 1. Turning it
clockwise increases the volume level of the
channel.
11. CHANNEL 1 INPUTS
These are the guitar inputs for this Channel and
both are identical.
1974X Top Panel
ENGLISH
ENGLISH
1 2 3 4 5 6 7 8 9 10 11
Top Panel: Extra thick, gold coloured Plexiglas (actually Perspex, causing some people to refer to it as
‘Perplexi’!) – exactly as the original. Specific details pertaining to the front panel features can be found on
page 5 of this manual.
Cabinet Construction: High-grade, flawless (knot-free) Baltic birch ply with fingerlocked (a.k.a.
comb) joints for maximum strength. The main cabinet frame (both sides, top and bottom) plus the front baffle
are constructed from 12mm ply while the back of the cabinet is 9mm ply. All edges have a 22mm radius.
Cabinet Cosmetics: The black Levant, beading, piping and small 6" gold logo are exactly as the
original. The original grey and white striped ‘Bluesbreaker’ grille cloth (used from 1965 to 1968) is no longer
available, which is a moot point due to the fact that it wouldn’t satisfy current-day safety legislation regarding
flammability because of its rubber content. Using special weave and dye technology, our current fret supplier
has worked with us to come up with a paper fret alternative which is cosmetically very similar to the original.
Rear Panel Improvements
The five features listed below are all ‘deviations’ from the original that have been added for user-friendliness,
practicality, added flexibility and/or improved serviceability. Please note that none of these have any sonic
impact (positive or negative) on the combo in any way.
Speaker Output Jacks: As mentioned earlier, no speaker output jacks were present on the original
– the internal speaker was hardwired directly to the output transformer and there was no provision for
external cabinet usage. Adding these allows you to use an extension speaker cabinet with the internal
speaker or, if you wish, disconnect the internal speaker altogether and use the 1974X to drive one or two
extension cabinets.
Important Note: The 1974X should never be used without a speaker load attached and the minimum rated
impedance should always be met.
Impedance Switch: Another feature that wasn’t present on the original but, in conjunction with the
Speaker Output Jacks, obviously adds to the unit’s flexibility.
H.T. and Mains Fuses: In the original these two fuses were located within the chassis itself, making it
extremely time consuming and cumbersome to access them should one blow. Making both fuses easily
accessible via the rear panel is another obvious improvement we’re sure you’ll agree.
Tremolo Footswitch Jack: The original footswitch was hardwired to the combo.
Note: The detachable Tremolo on/off footswitch that is supplied with your unit is an exact, diecast copy of
the original.
Mains Cord: The original was hardwired to the unit, for serviceability and sheer practicality the mains
cord on the re-issue is detachable.
1974X hbk 21/5/04 3:52 pm Page 4
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