User manual MARSHALL EL34 50

[. . . ] When designing our EL84 20/20, EL34 50/50 and EL34 100/100 Power amps, our valve design experts utilised all the knowledge and skill at their disposal with just one thing in mind - improved performance!Their combination of traditional Marshall valve technology with new and innovative circuitry, has resulted in designs that are radically different in terms of both looks and performance. The quality of tone produced by these all valve power amps is truly remarkable and, by reflecting all that is best about Marshall, will become an essential part of any serious stereo rack guitar system. I strongly suggest that you read this handbook carefully before operating your new stereo valve power amplifier and wish you every success with it. [. . . ] With the EL34 50/50 and EL34 100/100 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, with little fear of accidental re-adjustment. The two power amp halves of your EL34 50/50 or EL34 100/100 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 affect the overall feel and playing response of your Marshall valve power amp. These improvements include Marshalls latest True Differential Inverter technology, which expands the capability of the phase splitter (inverter). 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. 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. To allow the secure fastening of 19 inch rack units in a rack enclosure, a series of mounting holes are provided on the front of the EL84 20/20 and on both the front and rear of the EL34 50/50 and EL34 100/100. As with all rack mount products of substantial weight, such as the EL34 50/50 & 100/100, the rear of the unit must be supported as well as the front, therefore suitable brackets should be obtained and fitted between the provided rear mountings and the rack case. It should always be remembered that valve amplifiers generate a certain amount of heat, therefore they should never be mounted, or used, in any situation without adequate airflow. Adds brightness and top end bite to your By depressing the Deep switch you will add more bottom end thud to your guitar sound. Note: To prolong the life of the valves it is always advisable to switch on the Mains Power Switch (item 7) about 1 minute before switching on the Standby (item 6). This allows the valves to heat up to full working temperature before use. On switching off, the Standby should always be switched before the Power Switch. [. . . ] Attenuated version of speaker signal giving whole tone of power stage. Takes the right input from a stereo pre-amp, or the mono input from a mono pre-amp. To conserve valve life, standby switch 2 should Remain off for at least 1 minute after powering up the amplifier. Voice B LED Indicates red when channel A's voicing Channel A voice toggle switch Selects voice To loudspeaker load - model EL34 50/50 - 50 watts RMS, model EL34 100/100 - 100 watts RMS. [. . . ]