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The Cornell-Plexi 18/20 is made to the basic circuit of the PA20 Plexi panel which was produced in the 60s. Additional Cornell design features like the switchable valve rectification and power reducer are fitted as standard.
The Cornell-Plexi 18/20 Head and Combo contain
the unique and original design feature:

The Cornell-Cream Box

Complementary push-pull class "A" output has been used in many renowned amplifiers throughout the history of guitar amplification. The problem with this basic circuit, which has remained common to all manufacturers with some minor differences, was one of unequal current flow through each output valve and unacceptable crossover distortion. At high output levels the problem is accentuated and results in a fuzzy sound.

We have corrected the design and resolved the problem by balancing the output and reducing the crossover distortion. This results in a much smoother sound at high output levels, the output having very little crossover distortion. The difference can be seen and measured on an oscilloscope.

We have encapsulated the components and called it the Cornell-Cream Box which describes the output tone. We now use this circuit in all of our complementary Class "A" push-pull output designed amplifiers.

About Plexi

Most of today's guitarists are aware of some amplifier history, and "Plexi" must be one of the best known nicknames for a range of amplifiers produced by Marshall from about 1963 to 1969. We have refined this fundamental design to its ultimate, tailoring the components and adjusting the circuit to produce the definitive Plexi sound.

Back in the late 60s there were very few rock bands not using this type of amp, and still today this classic tone can be heard. The Cornell-Plexi amp has that instantly recognisable sound, and if you play rock, or simply want the Plexi tone, this range of amplifiers is an absolute necessity. Whether it is the 18/20 head or combo, or the 45/50 stack, these amplifiers are in the business of classic rock tones.

Panel Features:

Channel One:
Hi & Lo inputs.

Channel Two:
Hi & Lo inputs.

18/20 (Rectifier).
Mains (On/Off).

Valve Complement:
ECC83 (x2)
EL84 (x2)
GZ34 (x1)

High 20 watts
Low 5 watts
8 & 4 ohms jacks.

Class A Push Pull Cathode bias
Contains Cornell-Cream Box

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