Build An Armstrong One-Tube Radio!
This little radio is the distillation of many circuits for
one-tube sets that have appeared since Edwin Armstrong invented the
regenerative circuit in 1912.
It uses the best features of
many one-tube sets and has features not found on most radios of its type. One
feature is the capacitor coupling of the audio output. This feature prevents
the “B” voltage from passing thru the headset and possible ruining the magnets.
It also allows direct connection to amplifiers without further circuitry and
allows the use of crystal earplugs when connected in series with a 10K ohm
resistor. The capacitor coupling makes the detector more stable and reduces the
“hand capacity” effect, thus making regeneration adjustment much easier.
Another feature is the
autotransformer type coil that allows better coupling of the signal from the
antenna and helps prevent the antenna circuit from loading down the detector
and making it tune broadly. The tuning of this little radio is very sharp for a
one tube set. Only the finest of components are used. One example is the
vintage style air variable capacitor. These are custom made from an old design
by skilled American craftsmen in U.S.A.
They are very precise and smooth.
No other one-tube set sold today offers all of these special
features.
Battery life is outstanding. The
3S4 vacuum tube filament only draws 50 milliamps so the "A" battery,
consisting of two standard "D" cells, will last hundreds of hours.
The "flywheel" effect of the regenerative circuit causes the
"B" battery life to be even longer, lasting many hundreds of hours.
The "B" battery consists of five standard 9-volt batteries.
The Armstrong One Tube Radio
covers the Standard A.M. Broadcast Band from 550 KHZ to 1700KHZ. Its powerful circuit pulls in amazing BCB DX
from hundreds of miles away. Customers have reported distances over 1500 miles
when conditions are right. One customer reported that, "The Performance is
AWESOME!"
You will love building this
little jewel. It is easy to construct
and the directions are very easy to understand and follow. Nothing can compare to the thrill you will
have sitting in a darkened room, lit only by the barely perceptible glow of the
single vacuum tube, while listening to your favorite shows, or distant DX
stations, on this little Armstrong One Tube Radio that you built by yourself.
These great looking, high
quality vintage style kits are designed to be just like homebrew radios that
were built in the 1940s and 1950s by radio hobbyists in the great vacuum tube
era. Only the best vintage type parts are used. The kits contain the American
Made air variable tuning capacitor, in-circuit tested N.O.S. 3S4 vacuum tube,
tube socket, fahnstock clips, solder lugs, resistors, capacitors, regeneration
potentiometer with switch, coil form, mounting brackets, stand-offs, screws,
magnet wire, hook-up wire, knobs, battery holder for "A" batteries,
battery clips for "B" batteries, and the fine quality ready-to-finish
routed wood plaque for the base.
Everything is included except the batteries, headset and antenna.
Order one today! With U.S. Priority Mail, it will be at your
home in two or three days! You can put it together in one or two enjoyable
evenings and then you can have years of pleasure listening to it and looking at
it!
Complete Armstrong One-Tube
Set Kit including all parts and easy to follow instructions
Only $69.95
Plus U.S. Priority shipping according to your Zip
Code plus $2.00 handling in USA. Please email us for
the cost of Priority shipping to your address.
(Outside U.S.A., please email for shipping cost)
How To
Order
1. For Mail Orders : Email us and provide your Zip Code. We will reply with your total including
shipping & handling.
2. For Credit Cards: Email us and provide your Zip Code. We will reply with your total including
shipping & handling, Then click on the PayPal logo below and follow their simple
instructions for sending money. You will need our PayPal address.
Our PayPal address is EMAIL: paul@modernradiolabs.com
EMAIL: paul@modernradiolabs.com