Marshall 9100 Dual MonoBloc Amplifier

Marshall 9100 Dual MonoBloc Amplifier in very good condition. There are some scratches from rack mounting, excellent operating condition.  Includes copy of manual and power cable.

Serial number 944256621

Models 9100 2 x 50 watt and 9200 2 x 100 watt stereo valve power amplifiers are the latest step forward in valve rack technology from Marshall. Built as dedicated guitar system based units, they incorporate many features that are both revolutionary and evolutionary. From stunning styling through to the radical circuit design, these power amps are in a sonic class of their own without any compromises to their true Marshall heritage.

The specially designed Marshall "Gold" front panel provides a deep recess in which the controls are sited giving a smooth uncluttered finish whilst allowing the controls to be set and forgotten about, with little fear of accidental re-adjustment. The removable top half contains a window, which in addition to showing the true glory of the valves when the amp is in use, provides easy access to the output valves when replacement becomes necessary. The two power amp halves of your 9100/9200 are totally separate “MonoBlocs”, a feature that is normally only found on expensive valve hi-fi power amps. This means that the only common electrical item (apart from when specifically cross linking inputs) is the mains supply and that nothing that occurs to one power amp can sonically react with the other half. Also in the unlikely event of one side breaking down, the other side will carry on working regardless. Our constant research into valve amplifier technology has resulted in further circuit design improvements which dramatically effect the overall feel and playing response of the 9100 & 9200.

These improvements include Marshalls latest True Differential Inverter technology, which expands the capability of the phase splitter (inverter) to be nearer to a true differential amplifier than most other circuits used today. Put simply, the phase splitter takes the incoming signal and inverts half of it. This inverted half of the signal forms the bottom half of the sound envelope and the non-inverted half forms the top half. The effect of T.D.I. technology is to give a more defined spectrum of sound over a broader band width without compromising the overdrive and compression effects for which valve amplifiers are famed. This also allows more radical uses of feedback networks and the incorporation of the “voicing” switching found on each channel. These incredible “voicing” options, which can be remotely activated, can be used to greatly expand your pre-amps tone forming at the flick of a switch.