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BACKGROUND TO THE NEW 18-20 AMP

 

The moxonamp model 18-20 amplifier is an all-tube TPTP hand wired design - often referred to as the "Mini Bluesbreaker"combo that outputs 18 watts RMS through a 12-inch Portraitfeatherspeaker. The amp is based on the original 18 watt “1974” design by Jim Marshall. This amp has two channels that can be operated individually or linked together.

The 18-20 uses three hi gain double triode tubes in the preamp stage and a pair of EL84 power tubes. It also is tube rectified, using a single EZ81. The EL84s are cathode biased meaning no need for bias adjusting when replacing tubes.

Channel one is specifically voiced as the "Lead" channel, while channel two is voiced for "Bass".

Each channel includes its own Tone and Volume controls. The single tone control increase bass in one direction and increases treble in the other.

Like the”1974” original it has the simplest of 2 channel preamps, one with just Tone and Volume controls, and one with added Tremolo. These feed into a cathode-biased 18W power stage, but the combination creates a dynamic and touch-responsive medium-gain amp that s perfect for blues and classic rock. At 18W, it's plenty loud enough for smaller venues and studio work.

OTHER FEATURES

include selectable impedance switch (not available on the original), as well as a detachable power cable, and back panel mounted fuses.

The retro Tremolo Circuitry.

PLAYERS will appreciate the tremolo channel. It can be dialled in for quite a dramatic effect and the intensity allows it to be much stronger than a typical vintage Fender tremolo stage when required. Note that the tremolo footswitch is included with the amp.

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