Lessons learned from some preamp designs with this topology take the performance to a pretty decent level.
What happens if you take a traditional EL84 push pull design and optimize it for overload recovery? Light will be shed on this issue.
The original SYclotron phase splitter. I’ve refined it over the years, and the current version can be found in the Equal Opportunity Preamp articles at Linear Audio. Basic topology is still the same.
A common engineering challenge in home audio is the addition of an active subwoofer system to speakers that have limited bass extension.
UPDATE February 2011: A better way to do this has been added at the end. A PLEASANT SURPRISE An email came. I could get a set of one of my all-time favorite commercial speakers at “a ridiculously low price.” Would I be interested? I did not hesitate. Rewind. If you...
Disclaimer & Warning
Tube circuits run on high voltages. High voltages are used to execute prisoners. Get it? If you don’t know exactly what you’re doing at some point, DON’T DO IT! Always try to have someone keeping an eye on you in case of an accident. Read the High Voltage Safety thread at diyAudio.com. If you off yourself, at least have the decency to leave a note to your widow and kids saying that I warned you!
As a consequence of their specialized nature, components used in tube circuits are either expensive, rare, or (unfortunately too often) both. So you want to minimize the number of components reduced to a charred mass. When the inevitable happens, don’t come looking for me to pay for it.