Notice to users of System Access to go. This program has some well meant abbreviation translators that result in some strange spoken phrases when reading technical material. If the common abbreviation for frequency modulation is preceeded by a number it is read as fathoms. I just can't fathom this one. The abbreviation for milli amps is read as mega amps. I guess they aren't electrical engineers or physicists. If the preposition in happens to be preceded by a number it is read as inches. If the letter P is followed by a number, such as in a model number for a piece of equipment made by Hewlett-Packard, it is read as pages. So, don't be alarmed when you read, quote, I used my H pages 410C to measure a current at test point 3 inches my AJ 15 fathoms tuner and it was 42 mega amps. End quote. I hope they get around to fixing this some day.

I'm sorry but I can't come up with a way of making the old parts catalogs accessible. They are scans of catalog pages. Typing them in as ASCII text is just more work than I can do.

What do I need to have fun with tubes?
Click here for the answer.

The Basic Stuff DC Circuits

AC Circuits

Vacuum Diodes

Vacuum Triodes

Tubes with Multiple Grids

AM, SSB, and FM

What is ground?

Transmission Lines
and SWR

How To Do It

Restoring Dead Capacitors

Reading Resistor and
Capacitor Color Codes

Ground Loops

Soldering and Unsoldering

Designing and
Building Speakers

Tips From
Mac's Workbench

Construction Projects

Inexpensive Line
Voltage Changer

Low Resistance Adapter
for a Digital Multimeter

Using Unmarked
Power Transformers

Filter Choke Analyzer

8 Simple Power Supplies

Power Supply & Amplifier

4 Ways to Breadboard

An IC Socket for Tubes

The Best Breadboard

Story of the Original
Koss Headphones

A Dedicated
Headphone Amplifier

A Load Box for
Testing Power Supplies

Making IF Transformers
No Coil Winding

Modifying a Heath IG-18
For Ultra Low Distortion.

PLL Frequency Control
For AM Band Receivers.

A Blank Space

A Blank Space

Useful and
Interesting Links

How AM Radio Works

How FM Radio Works

Winding Coils

Build a Crystal Set

Build De Forest's Audion

Grid Leak Detector

Plate Detector

Infinite Impedance

Regenerative Detector

TRF Receiver

Simple Superhet Receiver

3-Tube Superhet

4-Tube Superhet

5-Tube Superhet
No Coil Winding

The All American 5

Introduction and
Power Supply

The Converter

The Intermediate
Frequency Amplifier

The Detector

The Audio Section

Cautions, Precautions,
and Troubleshooting

Photo Gallery

Missing Model.

Projects by Viewers
of this Page.

Tour My Kilowatt
Ham Station

Tour My Old Tube
hi-fi and Stereo
My Woodshop and Other
Construction Projects
A New Workbench
and Other Helpful Things
Operating Instructions

Silvertone Wire Recorder/

Instruction Manual

A Blank Space

A Blank Space

Viewer's Projects

Catalogs of
Discontinued Parts

Audio Amplifiers
How They Work

Power and Output

A Basic Power Supply

A Technical Discussion
of Power Supplies

Resistance Coupled Amplifier,
A Basic Building Block

Magnetic Phono Preamp

Volume Controls

Tone Controls

Balance Controls

Phase Inverters, Phase
Splitters, and Drivers

Push-Pull Outputs

Overall Feedback,
Pros and Cons

The FTC and
Amplifier Power

Building Amplifiers

How Much Power
is Enough?

A Low Distortion
Gain Block

Distortion in
RC Amplifiers

Practical Tone Controls

Phase Inverter/Driver
The Heart of an Amplifier

An Amplifier Test Bed

Experiments with a
Triode Power Amplifier.

Designing an Amplifier
with Feedback.

50 Watt Monoblock Amplifier

Ultra Linear Monoblock

Triode Monoblock

An EL34 Ultra
Linear Amplifier.

A Unique Circuit
Circlotron Amplifier

Restoration Projects

1937 Philco Radio

Heathkit Power Supply

Harman-Kardon A-300

Model 20


Tube Cross-reference
and Selection Guide
Free Programs
You Can Download

Other things
you can download.


Electronics for Physicists


E-mail me

Do you like music? I also write songs which are arranged and mixed so you can understand the words, and the lyrics are worth listening to. Take a peak into my right brain. Visit Max's Music Place. Click here.

Everything you always wanted to know about
vacuum tubes but didn't know who to ask.

Ask Tube Man.

Would you like to tinker around with tubes but don't know what to do? Want to fix up that radio that belonged to your great-grandfather but don't know where to start? Are you experienced in working with tubes but you just came across a problem which has you stumped? Tube Man knows all and tells all. Just click on the super hero's picture to email a question to him.

Here is a picture drawn by Sue of an old style tube with a face and arms. Click here. SHA ZAM!">

See questions submitted to Tube Man and his answers. I apologize for being so far behind on this page but I'll catch up someday.

Go back