EJ Jurich

EJ Jurich

This is the home page for EJ Jurich,
author of
Vacuum Tube Amplifier Basics.

Vacuum Tube Amplifier Basics
Second Edition

Vacuum Tube Amplifier Basics - Second Edition

Vacuum Tube Amplifier Basics
Second Edition

Vacuum Tube Amplifier Basics - Second Edition

The book is laid out with reference sections covering technical information that pertain to vacuum tube circuits. Includes Ohm's law, voltage, current, power, and watts. Explains capacitors, series circuits, parallel circuits, voltage dividers, reading circuit drawings, plus other related information. Principles of vacuum tube operation and power output are explained. Includes the functions of grids, the effect of tube capacitance, tube resistance, heat dissipation, bias, and calculating voltage gain. Vacuum tube and solid-state power supply design is included. An amplifier design example takes you through the steps of fabricating a chassis and designing a Class A stereo amplifier with volume and tone controls. The amplifier design example includes high-resolution images. Working with electronics and vacuum tube circuits requires some math. Circuit calculations in this book use various forms of addition, subtraction, multiplication, and division. Formulas are all solvable using a standard 12-digit calculator (requires a square root key). Calculations are presented with examples. Project circuits with layout drawings include a line amplifier with 25 dB gain, a turntable preamplifier, a 6V6/6L6 Class A monoblock amplifier, a 30-watt monoblock amplifier, and a basic 5-watt guitar amplifier. The 30-watt monoblock amplifier is designed for tube rolling using various types of output tubes.
Format: PDF eBook
ISBN: 979-8-218-61168-2
File size: 31 MB
Price: $12.00 US

 

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When comparing amplifier specifications, keep in mind that the amplifier is not the last link. Actual system performance is dependent on other factors such as room acoustics and box & cone speaker systems (cone speakers mounted in an enclosure) that introduce distortion. What really matters is what sounds good. Beyond the realm of equipment test results, it is an area more appropriately left to the field of psychoacoustics. Regardless of equipment specifications, sound reproduction preference is a matter of the listener's perception.

Building a vacuum tube amplifier can be expensive. Transformers and power output tubes can be especially pricey. If you are working with a tight budget, there are options available to help reduce costs. For the audiophile working on a home system, referring to sound pressure levels for loudness can save you money and save your hearing.
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Capacitors are available in many flavors, from low-cost general purpose capacitors to high-end Audiophile grade capacitors that can get very costly. Searching audio forums, you will find discussions as to which capacitors sound better. You might consider selecting capacitors from a technical viewpoint. More expensive does not necessarily mean better.
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In 1973, Russell O. Hamm wrote an engineering paper on the subject of vacuum tubes versus transistors. The primary focus of the paper concerns differences of sound under overload conditions.

Russell O Hamm PDF

A 1947 Wireless World article was written by W. T. Cocking on the subject of balanced push-pull output stages. It is interesting reference material on the subject. The article explains the balance process.

Push Pull Balance

Cathode follower output circuits using a 6SN7 or 12BH7 providing high-to-low impedance matching. Ideal for use as an output circuit in an audio control unit. Wide frequency response and low distortion.

6SN7/12BH7 Cathode Follower Output

This stereo headphone amplifier project uses one section of a 6SN7 as the output tube for 1/2 watt output per channel. Speaker output jacks are also provided for speaker background listening.

6SN7 Headphone Amplifier

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Des Moines, IA 50316

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