User manual MARSHALL EL34

[. . . ] For stand alone use, a clearance of 30cm is required at the top, back and sides. PLEASE read this instruction manual carefully before switching on. Models EL84 20/20, EL34 50/50 and EL34 100/100 stereo valve power amplifiers are the latest step forward in valve rack technology from Marshall. [. . . ] 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. Similar to the difference between open and closed back cabinets. 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. The standby facility is particularly useful live, where before playing and between sets, it allows you to keep the valves operating at a slightly reduced temperature but without any sound being produced. Supply to the valves and allows the valves to remain heated when not in use. [. . . ] 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. [. . . ]