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MintMost buffers on the market are the simplest opamp circuit possible-one opamp stage with unity gain, just a few resistors and capacitors are needed. These do the job of having a high input impedance and a low output impedance to drive your signal to the amp nice and strong. But many cheap buffers like that just don't sound and feel the same as the original best tone described above - a good cord direct into your amp. These buffers can send too much high end through, and sound brittle or HARD, not a nice feel. Many great sounding pedals like tube screamers, etc don't run your signal directly into the op-amp, instead they use a transistor input buffer. We use the same transistor as an old tube screamer on the input of our buffer, with the same input impedance of 510K. We also use the tube screamer's JRC4558D opamp later in the circuit for a warm but clean unity gain amplifier.There is a great article on buffers on the DIY site AMZ muzique.com where Jack says,"An opamp is an even better buffer amplifier, though many believe they are somewhat colder sounding and more sterile than the transistor versions. The opamp gain is exactly unity and the output impedance is quite low; typically measured in tens of ohms instead of hundreds as with the transistors."We use both the transistor on the input and the op-amp on the output for the best of both worlds - nice silky tone and strong output.A customer wrote me a note: "I was reading on your website about buffers. So I started messing around with an Analogman Tube Screamer before my dirt and turning the delayed signal doen on my ARDX20 at the end of the chain (like your buffer at the beginning and end). Woah I got all my dynamics back. Other buffers have made my dirt too raspy and have nasty high end. Looking at other buffers output and input impedance, maybe they are putting too much high end through?"
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