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Summary of Contents for Cornell Plexi 18/20
- Page 1 Cornell-Plexi 18/20 Head or Combo Owner’s Manual DC Developments Mmusical Equipment Design & Development Unit 13 Rosshill Industrial Park, Sutton Road, Southennd-on-Sea. Essex SS2 5PZ : 01702 610964...
- Page 2 Please read all instructions before operating unit! If you require any further information regarding this amplifier or any other CORNELL products, please do not hesitate to contact us. WARNING: TO PREVENT DAMAGE, FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.
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Page 3: Construction And Design
These amplifiers remain a legend which is reflected in their secondhand value. Construction and Design The Cornell-Plexi amplifiers are not one hundred percent copies of the old 1967 models, they are more like one hundred and ten percent copies! Research has shown us that not all amplifiers made at this time were the same, minor changes - not just in a visual sense, but also in the basic circuit design - appear between batches made at the factory. -
Page 4: Technical Design
The Cornell-Plexi 18/20 has a Class A output design achieved by means of a fixed bias resistor. The resistance valve is selected to complement exactly the characteristics of the output valve. With its Class A output, the Cornell-Plexi 18/20... - Page 5 Controls Input Hi & Lo. Jack plug input connection for your electric guitar. High impedance input connections for instruments. Input Hi provides 6db more gain than the Lo input. Both inputs are identical if used simultaneously. Volume Adjusts the gain of the pre-amp and is used in conjunction to set the overall volume of the amplifier.
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Page 6: Specifications
Specifications POWER..........115 Volt A-C 60hz 80 Watts US Model 230 Volt A-C 50hz 80Watts GB Model FUSE..........T1 Amp for the 115 Volt US Model T 600 m/Amp for the 230Volt GB Model INPUT IMPEDANCE....Input HI 2.2 Meg Ohm. Input LO 94k Ohm. CONTROLS........ -
Page 7: Tube Replacement
TUBES ARE HOT! Wait for the tubes to cool or replace tubes when amplifier has not been used for several hours. Your Cornell-Plexi 18/20 amplifier has 4 valves: two pre-amp valves 12AX7 or ECC83, two power valves EL84 and a rectifier GZ34.
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