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Single-ended tube amplifier with two 1626 tubes in parallel per channel
Six JAN (joined army navy) tubes, after some 40 years of rest, finally make music…
I started this project with the idea to build a simple single-ended tube amplifier. I didn’t have any experience with the construction of tube amps so I was looking for a [...]

I built a 2A3 SE (Single Ended) amp a long time ago. I built it because I wanted to see what all the fuss was about, so I built it using the parts I had. I had received a pair of Chinese 2A3 in return for some help with a phono preamp. I also had [...]

Here’s a 2A3 SE amplifier that I had just finished yesterday. I used a pair of EH’s 2A3 gold grid and a pair of RCA’s 6SN7 for driver stage. The photo shown Chinese 6N8PJ( Chinese Military 6SN7) for testing. I use solid state rectifier and use 2 pcs of 100 ohm paralleled to replace the [...]

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 [...]

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 [...]

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 [...]

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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