Amplify your sound with the Kay 540 Instrument Amplifier. This amplifier is serial number 3005 and less common than the 504. It resembles the Kay 703C in its tube compliment except for the20EZ7 (the 703C has a 18GD6A instead) . There's a hole where the footswitch jack used to be. Otherwise this vintage tube amp works as it should.

I have tried to describe this item correctly and welcome your questions.