The Heretical Preamp, p3

Apr 28, 2008 | Heretical

To review, in Part 2, we considered a very basic transformer-coupled input, capacitor-coupled output unity-gain preamp. That circuit is, as it stands, an excellent performer. We do need to power it and to build it, so those circuits and options will be considered...

The Heretical Preamp, p2

Apr 28, 2008 | Heretical

Third step: Design details Looking at the plate curves for the ECC88, we see that with 90V on the plate, a cathode-to-grid voltage of 1.7V will give us the desired 10mA minimum current. The significance of this choice will be clear later. Nonetheless, this is a common...