This unit was built for Mario Voltolini in Italy. It uses a new motherboard pcb and LCD display board designed by Eric Thacker and a number of new subassembly pcbs designed by yours truly. These new boards support the modifications devised by Steve Mitchell and myself to improve the sound and suitability of the Yuan Jing 6N3 valve preamp for use with a guitar input, rather than its original design purpose as a HiFi preamp.
There is also a neat little MIDI interface board and a switchable Cutting Edge Filter (CEF) as per the design by Charlie Hall.
Mario requested the ability to turn off the echo by using a remote footswitch so I added a bypass circuit using a signal relay to bypass the echo module. It’s not true bypass as we wanted to retain the tone of the valve preamp when bypassed.
Click on the thumbnails below for a larger picture and explanatory captions.
The metal work completed for front and back panels.
LCD/Buttons board and rotary encoder
Gain, Volume, Input and Tone Switch.
CEF Board – component side.
CEF Board – Switch Side
The MIDI Interface – it’s tiny!
The MIDI sockets, Output jack socket and footswitch jacks and the bypass circuit – these fit on the back panel.
In the process of wiring
Inside the finished box
Good view of Ecca’s motherboard and display board joined by ribbon cable.
Front view of the finished Echotapper Vintage Echo Machine
Rear view of the finished Echotapper Vintage Echo Machine
The patch change footswitch.
The bypass footswitch. The LED is on if the echo is on.
The mods to the underside of the valve preamp
The new pcb for the interstage coupling circuit is visible top left. The dual volume control originally fitted has been removed and replaced by the two 3-way connectors labelled A and B