Plug in the opamps, bias the transistors, control the signals, measure the voltages, analyze the frequency spectrum by sweeping and finally the pedal is ready to leave the workshop. This is the same for each pedal. By hand, myself. Scope screens show 2 gain stages of Preface Drive in different topologies. Superb! #alengeere #pedals #prefacedrive (at Istanbul Province) https://www.instagram.com/p/BxnYrVmnO8A/?igshid=632bwxrldxhk










