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Tube Amp Construction

I wanted to ensure that the amp could be modified easily as it was “experimental” and I also wanted it to look good. I always try to build things with the thought that the end product is going to be on display. The enclosure is a wooden “shadow box” that came from a department store. The top is a thick piece of Plexiglas given to me by Barry who used Plexiglas for the enclosure of his K-502 Tube Amp Project (thanks Barry). The circuitry is on three boards. Each amp channel is on a separate board. The boards are copper clad and the conductive surface is used like a ground plane. The power supply (less SMPS) is on a plain perforated board. All wiring is point to point. My original design was to use a printed circuit, but it quickly became clear that it would be difficult to modify. The bottom (to keep me from sticking my fingers on the B+) is an ornamental aluminum door screen cut to fit that came from the hardware store. Read more

Inrroduction

This project is a bit of a departure for me. I really didn’t need another amplifier as I have lost count of how many are around the house, perhaps as many as 15 or 20. This project was an exercise in what would happen if I combined some interesting concepts. I first saw this type of output circuit on diyparadise and if mine looks a lot like that one, it is because it is similar. So why did I call it Oddwatt? Well at first glance it looks like it shouldn’t work or at best work poorly. To my surprise, it not only works, it works well! Read more

by Lord Valve

Revised 08/24/01

DISCLAIMER: LORD VALVE (W. WHITTAKER DBA NBS ELECTRONICS) WILL TAKE NO RESPONSIBILITY FOR ANY INJURIES OR DAMAGE SUFFERED BY ANYONE AS A RESULT OF THE MISINTERPRETATION OR MISAPPLICATION OF THE INFORMATION CONTAINED IN THIS ARTICLE. PROPER HIGH- VOLTAGE SAFETY PROCEDURES AND PRECAUTIONS MUST BE PRACTICED AT ALL TIMES WHEN SERVICING VACUUM TUBE AMPLIFIERS!! IF YOU ARE NOT *COMPLETELY* FAMILIAR WITH THESE PRECAUTIONS, SEEK GUIDANCE FROM SOMEONE WHO IS! Read more

This is the method I use to bias my amps. It’s not the only way to bias your output tubes, but I think it’s the safest and easiest method.

Essentially, you want to bias your amp such that the plate dissipation rating of the output tubes is not exceeded. Plate dissipation is measured in watts (but don’t confuse this plate dissipation rating with the audio output power of your amplifier, which is also measured in watts). Read more

This vacuum tube amplifier project was inspired by the Spare Time Gizmo’s 6T9 tube amp. This got the ball rolling of ideas in my head and soon it was evolving from one idea to another. I decided to make the amplifier with a push-pull output stage using circuit ideas from my EICO HF-81 and my RCA Receiving tube manual. Read more

Introduction - Fostex FX120 MLTL Speaker Project

My first introduction to fullrange speakers was about 4 years ago in a German diy audio magazine which featured a small transmission line speaker project using a Vifa 10 BGS 119/8 driver. I decided to give them a try and was surprised with the sound quality! Of course they did not play as loud as the bigger two-way speakers that I built before, but something else was fascinating. Fullrange drivers seem to play music with more coherence, more life and they sound more direct. However, there are compromises with fullrange drivers; little drivers have disadvantages at the low end and bigger ones at the top end.

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Introduction

This is a recipe to construct some very simple diy speaker cables. I use these cables with my DIY Hi-Vi 3-Way Speakers. The following materials were used for these simple DIY Speaker Cables:

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As anyone who knows about tube amps will tell you, “The output transformer is the most expensive part”. Not is it is only the most expensive part, but is is also probably the hardest part to come by. Parts for tube amps in general are a lot harder to find then other more common electronic parts. Transformer theory for power transformers is pretty straight forward and it is fairly easy to find information for winding a power transformer of any type and size. Read more

I decided to build a tube amp for the fun. In fact I think of that stuff since a really long time now (since the first amp, I ‘ve built ten years ago).

There is a lot schematics on the internet, but finding a good one is pretty hard. I want to build something like that:

Read more

What is a Vacuum Tube ?

In electronics, a vacuum tube (U.S. and Canadian English) or (thermionic) valve (outside North America) is a device generally used to amplify, or otherwise modify, a signal by controlling the movement of electrons in an evacuated space. For most purposes, the vacuum tube has been replaced by the much smaller and less expensive transistor, either as a discrete device or in an integrated circuit. However, tubes are still used in several specialized applications such as guitar amplifiers (also called a valve amp outside the U.S.) and high power RF transmitters, as a display device in television sets and in microwave ovens. Read more