MARSHALL tube preamplifier. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Tube Power Amplifiers
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MARSHALL tube amps designed for electric musical instruments use both equalized preamplifiers and preamplifiers that simultaneously function as effect units. One of the features of such amplifiers is that they often use cathode followers, in which the lamps are switched on in a common anode circuit. A schematic diagram of a preamplifier of this type with a tone correction unit is shown in the figure.
This preamplifier is assembled on an ECC83 type tube, which is a double triode. The first triode VE1a works like a classic signal amplifier, its anode is directly connected to the grid of the second triode VE1b. The second triode is connected according to the cathode follower circuit, its gain is less than 1. The main advantage of this inclusion of the VE1b triode is to provide a relatively low output impedance of the amplifier, which allows you to connect a correction stage at the output.
In the correction block, the treble level is controlled by the P1 (TREBLE) potentiometer, the mid frequencies by the P2 (MIDDLE) potentiometer, and the high frequency level is set by the P3 (BASS) potentiometer. The volume level is regulated by the P4 (VOLUME) potentiometer, through which the amplified and corrected signal passes to the stages of the final amplifier.
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