In my opinion, a major advantage of zero-bias and grounded-grid tube operation should include the elimination of bulky bias supplies and rf feedback circuits. This original circuit layout built up in the shack as a homebrew amplifier should have the bias (control) applied through the filament transformer center-tap and the neutralizing capacitor circuit left out (if appropriate current amplifier construction techniques are used).

As time allows, I hope to scan in a redraw of a more conventional 811a amplifier circuit layout to add in this package. The addition of a tuned input would also be great. I have an 811a amplifier I built in the 80's using a similar circuit circuit, which as built has never failed or shown instability in operation. More to come, please enjoy the diagram as presented and feel free to Email me your comments or things you have to make available.

enjoy
skipp

We/I get a lot of Email from visitors who drop into these file down load description pages via a web search "engine" (like Google). Vistors are not able to locate the file download icon for that specific description page. There is a simple way to find the file download icons on the main http://www.radiowrench.com/sonic sonic web page...

First and best: Use the menu icon just below to the main sonic page.

Second: Back space out the page your now looking at in your browser location line. As an example, using the http://www.radiowrench.com/sonic.so2004.html description page. Remove the last portion of the web location with the keyboard back space key to read http://www.radiowrench.com/sonic then press your Enter Key to reload the main sonic page "just in front" which would probably has the inforamation you're looking for. This works on most of the current browsers at most web sites.