the Radios Gallery

1922 Deforest RAdiohome DT-700 - Deforest Radio Telephone & Telegraph Company

Deforest DT-700

image32

  Deforest Radio Telephone & Telegraph Company first sold this receiver in 1922.  A single tube receiver  that required  a headset for listening or could be connected to one of the early amplifiers of its day. The operator would change coils for different frequencies.  It originally sold for $36.00.

Instructions

image33

The  instructions for battery hook up, ground and antenna are in the lid.

Antenna Set-up

image34

The recommended antenna and ground set-up in 1922.

1923 RCA Model II AR800 Portable - RCA Victor Company, inc. new york city

image35

Radiola II

Production started in December of 1922 at General Electric for RCA. The Radiola II is a TRF radio with regeneration.  GE stopped producing the radio in 1924.

image36

Tube Lineup

As you can see below,  the Radiola II used two UV-199 tubes.

image37

Batteries

Early models use two "B" batteries mounted in the back for 45 volts of power. Later models could drive a loudspeaker by using 90 volts and a "C" battery to reduce distortion.

1922 RC- RCA Victor Company, New York city

RCA/Westinghouse Radiola Model RC

image38

In 1922 RCA came out with the RC model, which was the 1921 RA tuner and DA detector/amplifier consolidated into one unit.  A  TRF receiver with regeneration,  it originally sold for $133.

Range

image39

The RC could  tune from 170 to 800 meters of the broadcast band and more with the optional "Long Wave Load Coil". 

Tube Line Up

image40

 The RC could use a UV-200 and two UV-201 tubes or three UV-201 tubes. 

Atwater Kent 3955 (model 3) early version 1922 Atwater kent Manufacturing Company, Philadelphia (procured from the Howard stone collection)

image41

Open Set (Breadboard)

 Although officially called an "Open Set", for obvious reasons it is more commonly referred to as a "Breadboard" radio. The 3955 is a TRF radio without regeneration.  The inventor of the regenerative circuit, Edwin Armstrong held a patent on his invention beginning in 1914 and A. Atwater Kent, the founder of Atwater Kent Manufacturing, did not want to  buy a license and pay a royalty on the radios he sold. (Click  photo on left for schematic.) 

image42

Armstrong Patent Work Around

 Atwater Kent sold the model 3 with a tuner, detector and two stage amplifier, leaving a space between the detector and tuner for the buyer to add a variometer for regeneration.

image43

Tube Line Up

The Atwater Kent 3955 was designed to use one UV-200 tube and       two 01A tubes or three 01A tubes. .

Paragon Model RA-10 tuner 1920 Adams-MOrgan Company, Montclair, New Jersey

No tubes

image44

The RA-10 was capable of tuning both broadcast and long wave frequencies.

Needs Help

image45

The RA-10 needed a detector tube unit to produce an audio signal.

Paragon Model DA-2

image46

The DA-2 , also sold in 1922, was designed to be paired up with the RA-10  providing a detector and two stages of amplification.

Atwater Kent 4333 - Model 5, 1923 ATWATER KENT MANUFACTURING COMPANY, PHILADELPHIA

image47

Compact Design

The Model 5 was the only open set officially sold under a single digit model number, the other open sets were given model numbers by collectors.  The radio consisted of a  Type 11 tuner and a five tube amplifier unit that used one tube for detection, two for  RF amplification and two tubes for audio amplification. The tube line up was five UV- 01A tubes or one UV-200 as a detector and four UV-01A tubes. (Click photo on left for schematic.)

image48

A Short Production Life

With sales beginning on September 7th, 1923 the model 5 was Atwater Kent's attempt to reduce the complexity and cost of radios.  However, the model 5 had poor selectivity with only one tuning device and the number of radio stations was growing rapidly in 1923.  Radios designed for tuning in  one or two stations, which is all many people could receive before 1923,  were doomed to obsolescence.

image49

Ugly Duckling to Beautiful Swan

Despite being a poor receiver and  corresponding poor sales, the  model 5 is one of the rarest and most sought after radios among collectors today.

Crosley model 51 - 1924 Crosley radio corporation, cinncinati, ohio

TRF With Regeneration

image50

The Crosley 51 was the next step up from the Crosley 50, adding an amplification stage so a speaker horn  could be used for listening.

Tube Line Up

image51

Two UV- 01A tubes comprised the original line up, later models could use UX based tubes and an added connection for "C" allowed the user to use a more powerful amplifier tube,  such as a 71A or 112A .

Great Performer

image52

The Museum's Crosley 51 is a great performer for a simple design, bringing in many stations clearly  with plenty of volume.

Atwater Kent 4052 (Model 6) 1923 ATWATER KENT MANUFACTURING COMPANY, PHILADELPHIA (procured from the ron frisbee collection)

image53

The 4052 open set was another radio with poor selectivity. Very capable of tuning in the two frequencies that most stations used in 1922 and early 1923, it soon became outdated as more stations and frequencies were added. (Click photo on left for schematic.) 

image54

Tube Line Up

The model 6 was designed to use four UV-01A tubes or one UV-200 as a detector and three 01A tubes in the T/A unit.

image55

The Parts

At the left end of the radio is a Type 11 Tuner, next is the Detector. The smaller unit in the back is a RF transformer and in front of that is a Potentiometer.

Radiola RS - 1923 RCA Victor Company, 223 BROADWAY, New York City

An Aeriola Senior Plus Amplification Circuit

image56

The RS is a TRF radio with a single AM circuit and regeneration.

Tube Line UP

image57

Designed for using two brass based, tipped WD-11 tubes. Those tubes were larger than the later model WD-11 tubes in the photo which made them easier to remove.

RCA Label

image58

The RS was manufactured by Westinghouse for RCA.

A. C. Dayton xl-5 1924 - A.C. dayton company, Dayton ohio

image59

Three Dialer

The XL-5 is a TRF radio without regeneration, three AM circuits and sold for $115.00 

image60

Five Tube Line Up

The XL-5 was designed to use five 01A triode vacuum tubes.

image61

Voltages

The XL-5 required 5 volts filament power, 22 volts detector power and 90 volts  for  amplification.

Atwater kent 4066 (model 7) 1923 ATWATER KENT MANUFACTURING COMPANY, PHILADELPHIA (Procured From the Ron Frisbee collection)

Atwater Kent's First 5 Tube Set

image62

The 4066 was designed to use five UV-201 tubes or a UV-200 detector and four UV-201 tubes. (Click photo above for schematic.)

A Second RF Stage Is Added

image63

The second RF stage boosted the signal so weaker stations could be listened to with a speaker horn.

Poor Selectivity

image64

The model 7 , with a single circuit tuner, suffered from poor selectivity.

crosley Trirdyn 3R3 Special 1924 Crosley RAdio Company - Cincinnati, OhIO

image65

REFLEX

The 3R3 Special is a TRF radio with regeneration.

image66

Loading Coil

The 3R3 Special was built with an antenna loading coil, seen below  attached to the left side interior of the radio cabinet.

image67

Tube Line Up

 The 3R3 was designed for to use three UV- 01A tubes.

grebe Model cr-8 1921 Grebe, A.H. & Company - Richmond hIll, New York

Broadcast & Longwave Receiver

image68

TRF radio with regeneration, two AM circuits.

Tube Line Up

image69

The CR-8 is a one tube receiver designed to use a UV-200 vacuum tube.  

Range

image70

The CR-8 has a range of between 150 - 1000 meters.

Atwater kent model 4445A (9A) 1923 ATWATER KENT MANUFACTURING COMPANY, PHILADELPHIA (procured from the ron frisbee collection)

image71

Later Version Of Model 9

This version of the  4445, the 4445A, came out a year after the original.  (Click photo at left for schematic.)

image72

Variometer Tuned

The 9A is a TRF radio without regeneration.

image73

The Tube Line Up

The 9A was designed to use four UV base 01A tubes or a UV base 00 detector tube and three 01A tubes.

Atwater kent 4640 receiver, (model 20 big box) 1924 ATWATER KENT MANUFACTURING COMPANY, PHILADELPHIA

image74

Three Dialer

The model 20 "Big Box" is a TRF radio without regeneration.  It contains three AM circuits and is broadcast range only. A later model, the 20C, is the same circuitry in a smaller cabinet.

image75

Tube Line Up

The model 20 uses a five tube line up consisting of five 01A tubes or a 00A tube as a detector and four 01A tubes.

image76

An Excellent Receiver

In the hands of a skilled operator, the model 20 is an excellent receiver with good sensitivity and selectivity  along with a relatively strong amplifier for it's era.

Colin/Kennedy type 281 receiver 1921 colin B. Kennedy Company, San Francisco CAlifornia & St. Louis Missouri

High End Receiver

image77

The type 281 was a top of the line receiver in it's day with an $80.00 price tag.  A TRF design with regeneration, it had a range of 175 to 600 meters.

Tube Line UP

image78

The type 281 was designed to use a UV-200 tube.

Listening

image79

The 281 could be used with headphones  or paired with the matching 521 two stage amplifier to drive a speaker horn.

Atwater Kent 4660 (model 9c) 1924 ATWATER KENT MANUFACTURING COMPANY, PHILADELPHIA

Another Radio Using The Model 9 Name

image80

The model 9C seems to be identical to the 10C except for having one less RF amplifier.  A TRF receiver without regeneration , as was all of Atwater Kent's "Open Set) radios.

Variable Condenser Tuned

image81

The 9C uses two variable condensers instead of a Type 11 tuner and a Coupled Circuit Tuner used in the earlier versions.

Tube Line Up

image82

The 9C could use four 01A tubes or a type 00 tube as a  detector and three 01A tubes.

STILL UNDER CONSTRUCTION - MANY MORE RADIOS AND INFORMATION ON EACH ONE ARE COMING!