The Pure Tone multi-contact jack was invented by Dave Linsk, lead guitarist of the International recording group Overkill. The jack was created as a result of constant failures of the current production jack models that have been available on the market until now. As it turns out, the 100 year old audio jack design really needed some changes to make it road worthy!
The standard jack utilizes a pressure ground and a single hot positive connection; as actual grounds are not connected to the sleeve, the pressure of the tip dictates how good the ground is, resulting in inferior sound quality (I.e., that “static sound”). Not only is the signal strength compromised and weaker, the actual sound is inferior because you never have a solid ground and the poor connection at the tip contact is so minimal.
With the new Pure Tone Jack, the audio jack as you know it will never be the same again. The Pure Tone audio jack has 2 actual concave ground contacts that hug the sleeve on both sides and 2 concave hot leads wrapping both sides of the positive tip. Not only is the signal much cleaner, stronger, and clearer, but all aspects of the EQ spectrum are also greatly improved while eliminating those nasty spikes. In addition, the Pure Tone jack has greatly increased the voltage handling capacity while leaving a smaller footprint for those tight spaces. The new standard jack has been born!
Graph 1 shows the unaltered direct dry signal with a standard Switchcraft jack. In Graph 2, the only difference to the signal path is the replacement Pure Tone jack. Signal path is as follows:
1981 Gibson Les Paul standard with a low output Motorcity pickup> Evidence Audio low capacitance Forte cable > Little Labs DI > Neotek Series II console (flat EQ & no processing). Recorded using ProTools.