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This article describes a power supply that can be used to provide relatively high voltage and moderate current for use in an audio amplifier (for instance 845 based). It provides a reasonably regulated 840 volts at up to about 100mA. This allows the builder to experiment at higher power levels without the worry about the [...]

Continuing in the series of “no parts” amplifiers, this article describes a push pull version of a class of amplifiers using only tubes, inductors and transformers. (including the power supply). This amplifier uses either power supply previously described, requiring about 250 volts and 75 volts for the high voltage supplies, and 6.3VAC for the heaters. [...]

In the previous article, I described a small SE amplifier that produced a couple watts and used no resistors or capacitors (and no batteries, solid state devices etc). Article can be gotten here. This also included the power supply. In this article, we will describe a regulated power supply that can be used with that [...]

845 based No R No C Amplifier
Is it possible to build a reasonably high powered amplifier without using any resistors or any capacitors? This article describes a 10 watt single ended 845 amplifier that does that very thing: that is, there are no resistors, capacitors, batteries, solid state devices etc anywhere.

There are different methods for measuring the power ratings for amplifiers and speakers. And different measuring methids give different values so it is vital to understand the difference between theosedifferent power ratings to be able to make at least some comaparisionf between different power ratings. This article is collection of information posted to rec.audio.tech newsgroup [...]

LMTHREE (Low Mu Triode with Higher Raw Efficiency Emulator)
1. Introduction
Power amplifiers are probably the audio components where you may find the largest variety of circuits and technology. Solid state or tubes, push-pull or single ended, triodes, pentodes, fets, bipolar transistors, class A, B, AB or any other letter you can think. Chances are that if [...]

Since 1999 when the original article “Why SE Tube Amplifiers?” was placed in the Internet I have received some feedback from readers. Part of this feedback has been in the form of direct questions and some through discussions on Internet groups that I have either followed or that I have been called attention by someone. [...]

1. Introduction
Single Ended triode tube amplifiers are not that hard to find anymore. You can buy them from many companies or you can build one with parts that are offered by dozens of suppliers. The high-end audio press has been talking about them for the past several years and it is very strange that something [...]

It’s possible to get most of the Thiele-Small parameters
from a loudspeaker by just accurately measuring the impedance
versus frequency. If this is done twice, one with the driver in open
air and one with an added (known) mass it should be fairly easy
to calculate the fs, Vas and Qt.

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