ImPasse Preamp Now Online

Apr 16, 2012 | Blog, ImPasse

By kind permission from AudioXpress, the ImPasse preamp article is now available. This preamp can also be used as a single-ended very high performance lineamp by grounding the non-inverted output (i.e., the capacitor coming from the plate of the phase splitter)....

The Heretical Preamp, p6

Apr 28, 2008 | Heretical

The Proof of the Pudding This is a plot of the spectrum from a 2VRMS 1kHz sine wave measured using an Audigy 2ZS soundcard and RMAA software in a noisy environment. The green plot is a straight wire loop from input to output. The white plot is the same but with the...

The Heretical Preamp, p5

Apr 28, 2008 | Heretical

In earlier parts, we considered a unity gain preamp with an ECC88 at its heart. The design was mostly conventional, but withal, a good performer, a unit that will not be the limitation in any reasonable system. Now it’s time to get unreasonable. And,...

The Heretical Preamp, p4

Apr 28, 2008 | Heretical

Plate Job With solid raw supply in hand, we move on to the next two inter-related problems- attaining the proper DC level and getting rid of the ripple and noise. This will require some regulators, or at the very least, more filtration. Let’s start with the anode...