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In Brief
Single-Ended Triode (a.k.a SET) amplifier producing 1…1.5W into 8 ohm load. Uses two Russian deflector combo 6f5p tubes wired as triode.
Introduction
6F5P is Russian TV deflection triode/pentode combo tube, somewhat like ECL85/6GV8. If the pentode section is connected in triode mode, the tube provides a great playground for experiments with 2-stage SET designs on a [...]

This is such an in depth subject that I will reserve my input to this component to more basic explanations and leave the permeability and make-up of core material, magnetic flux density, shunt capacitance/inductance, electromagnetic theory and the like
to references.

A SE transformer has to do two things in life… carry the unbalanced DC and have enough magnetic oomph to do the AC duties well. PP outputs (largely so) are relieved of the DC duties. As a very general approximation the SE transformer will be four times as large as the PP transformer for equivalent [...]

A common-cathode triode stage exibits an harmonic spectrum decreasing (in a monotonic way) with the frequency and the contribution furnished from even harmonics (particularly the second one) is preponderant. A similar pentode stage presents a wider spectrum and therefore a general increment in the THD values and a greater contribution furnished from odd harmonics. These [...]

INTRODUCTION
This article is the second part of my examination of the output impedance (Zout) of triode single ended amplifiers using no negative feedback. Here I intent to examine carefully the effects at low frequencies, which I believe can help you understand the sometimes puzzling bass performance of SE amplifiers. With the help of the Thielle/Small [...]

INTRODUCTION
Much has been said about triode SE amplifiers with no negative feedback - how good they sound, how lively they present a musical performance and so on. Two easily measurable characteristics that make this type of amplifiers sound different are the amount of distortion produced with its particular spectrum and the high output impedance. This [...]

In the autumn of 2005, just on a whim, I listened to the CSS FR125S (on the right) simply mounted on a board. I was shocked at how much better they sounded than when boxed in, having tried them in several boxes. Then I tried the Visaton B200 (center), which is a driver purposefully designed [...]

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 [...]

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