The Cornell Plexi 20 is a fantastic all-valve twenty-watt class ‘A’ amp perfect for studio and home use, it is also suitable for playing small venues. 
The EQ cut switch is a bypass for the tone controls, increasing the Gain and Middle response. 
It has separate Treble and Bass controls (with EQ in) for tone shaping.
This amp is completely hand built in the UK, it has a built in full to low power reducing to 5W, this reduction has very little impact on tone. This amp produces a classic valve distortion tone making it perfect for any blues or rock player. 
 
"The little Plexi is probably the best amp I’ve every had.
Many thanks again for making this thing - it's probably my favourite amp I own."
Bruce Dickenson