I'll have more to say in an upcoming AudioXpress piece, but overall... I was depressed. Things that should have sounded good didn't (beyond room issues), things that are made to impress sounded spectacularly unreal, the bullshit was heavier than ever (and more...

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The SYclotron

This is a circuit I came up with some years ago, based on the cross-coupled inverter; although at first glance, many people thing "cascode," it isn't. Note that the FETs are p-channel and configured as source followers. Each FET drives the cathode of one side and the...

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Biamping the NHT M3.3

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...

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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 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.