Sold by Sears as the Precision Type 2, this was a TRF radio with regeneration.
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.
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.
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.
Headphones, which came with the Radiola I, could be stored in this rear compartment along with an antenna and ground wire.
The Type 220 has a range of 175 to 3100 meters.
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.
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.
The Type 525 used two 00 type one amp tubes with a pair of transformers for audio amplification.
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.
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.
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.
Three tubes, one detector and two amplifier tubes are used in this radio , all are 01A tubes.
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.
With three RF tubes and three stage audio output the Super Six is a very good performer in skilled hands.
TRF radio without regeneration.
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.
Designed for a UV-200 tube, it works well with a UV-201A rainbow tube and looks good too.
Globe Electric manufactured radios for only three years, 1922-1925.
5 tube line up - 01A's all !
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.
The company made radios and parts for six years from 1918-1923.
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.
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.
The BC-14A was used by the U.S. Army Signal Corp during World War I.
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 used a tapped coil, variable air capacitors and a fixed condenser.
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.
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