Crosely Type 2 (1924) Crosley Radio Corp. - Cincinnati, OH
Sold by Sears
Sold by Sears as the Precision Type 2, this was a TRF radio with regeneration.
A Crosley 50 In A Small Cabinet
It sure is tight in there, this is 2nd smallest mass market 20's battery tube radio I've ever seen, only the Crosley Pup being smaller. Inside is the usual Crosley book capacitor, tickler coil, grid-leak and grid-leak mica capacitor and WD-12 tube.
RCA Radiola ER-753A (1922) RCA Victor INC, New YOrk
RCA Brands All Its Receivers "Radiola"
Originally RCA called this radio the ER-753A. In late summer of 1922 RCA changed its name to the "Radiola I". They had decided to brand all their radios as Radiola. Examples of this model in excellent condition are rare.
No Ink Fill
Early models of this crystal radio had red and white ink fill in the control panel. The Radiola I pictured here has no ink fill in the lettering of the control panel, which means it was produced in July, 1922 during the second run of manufacturing.
Rear Compartment
Headphones, which came with the Radiola I, could be stored in this rear compartment along with an antenna and ground wire.
Colin B. Kennedy Type 220 (1921) - San Francisco/St. Louis
TRF Receiver
The Type 220 has a range of 175 to 3100 meters.
Later Version
This is a later version, identified as such by the two cities names on the front panel and the bakelite caps on the binding posts. Earlier versions had San Francisco only on the front bakelite panel and the caps were nickel plated steel.
Tube Lineup
The Type 220 uses a 00 type , one amp detector tube. Kennedy products are considered one of the "top of the line" brands of its era.
COLIN B. KENNEDY TYPE 525 (1921) ST. LOUIS / SAN FRANCISCO
Two Stage Amplifier
The Type 525 used two 00 type one amp tubes with a pair of transformers for audio amplification.
Early Model
The Type 525 pictured here is an early edition, identified by having only the city of San Francisco on its face plate and having steel thumb nuts topping off its binding posts.
Shelf Mates
The Type 525 amplifier could be paired with the Type 220 receiver as shown (left) or the Type 110 receiver to drive a speaker horn.
Crosley type 52 (1924) crosley Radio Corp. , Ohio
TRF
The Crosley was a TRF (tuned radio frequency) radio , Crosley radios are considered good performers for a low cost radio.
The Type 52 was basically a Type 51 with a second stage of audio amplification.
Tube Line-up
Three tubes, one detector and two amplifier tubes are used in this radio , all are 01A tubes.
Neutrowound Super Six (1926) neutrowound Radio MFG. Co.
The "Armoured Breadboard"
Because of its unique steel housing the Super Six is often referred to as "The Armoured Breadboard" among collectors. Sadly, the company only lasted about five years.
On the right side is a ground connection with four antenna connections for different length antenna's.
Six 01A Tube Line-up
With three RF tubes and three stage audio output the Super Six is a very good performer in skilled hands.
Splendid SR. (1922) , Main Radiophone Co, Cedar Rapids, Iowa
A Rare Bird
TRF radio without regeneration.
Short Life For The Company
Not much information about the company is available, looks like they may have only been around four or five years. I need to do more research on this new addition to the gallery.
Tube Line-up
Designed for a UV-200 tube, it works well with a UV-201A rainbow tube and looks good too.
DuoDyne No.815 1924 Globe Electric Co, Milwaukee Wisconsin
Very Rare Radio
Globe Electric manufactured radios for only three years, 1922-1925.
TRF Without Regeneration
5 tube line up - 01A's all !
Unusual Circuitry
The rheostats seem to have a fine adjustment in the center of the knobs, this just came in and more research is needed on this model. If you know where a schematic of this radio might be acquired, please contact the museum.
Sodion Dr6 + two D-11-1 amplifiers (1923)
Built by Connecticut Telephone & Electrical Co.
The company made radios and parts for six years from 1918-1923.
DR6 Tuner
On the right side is the DR6 TRF tuner without regeneration with a Cunningham UV-299 vacuum tube, the tuner was designed to use a Sodion S13 tube.
Twin Amps
On the left, two D-11-1 single tube amplifiers also using type 99 tubes. Its likely that there's relatively few of these combo units around today.
BC-14A (1918) General Radio co, cambridge MA
Military designation SCR-54A
The BC-14A was used by the U.S. Army Signal Corp during World War I.
A Crystal Radio
The BC-14a used a standard crystal detector with a buzzer circuit. The buzzer let the operator know when he had a strong signal coming through the crystal detector.
The Receiving Circuit
The receiving circuit used a tapped coil, variable air capacitors and a fixed condenser.
SCR-74A (1919) AmRad Corp, Medford Hillside MA
Trench Transmitter
In 1919 American Radio & Research Corporation (Amrad) received and order for thousands of these spark transmitters from the U. S. Army Signal Corps.
The membrane on the right side of the lid allowed the operator to transmit a message with the lid closed.
In 1925 Amrad filed for bankruptcy and the remains of the company was bought out by Crosley Radio Corporation. The Amrad name was used on radios until 1929.