Sold by Sears as the Precision Type 2, this was a TRF radio with regeneration.
See the museum's video on this radio - Sears - Roebuck SR2, The Mighty Mouse of Radios - YouTube
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 use type 99 tubes. Its likely that there's relatively few of these combo units around today.
This Crosley uses two of the "book" condensers they were famous for in their early years, it also did not have a "tickler" pull out knob that many of their early radios used.
The Crosley VI used two 01A tubes, one detector and one amplifier.
The Crosley VI design also eliminated the transformer, using a single tube for the amplifier. You could drive a speaker horn when listening to stronger stations.
This early Crosley amplifier was manufactured just two years after the company's founding in 1921. Crosley closed in 1956
This two stage amplifier was designed to be used with Crosely's Ace V receiver, but could be paired up with many receivers of its day.
The Grebe RORD consists of a single stage tube detector and a two stage amplifier. It was typically used with a Grebe CR-2 or CR-3 tuners.
This is the second version of the RORD. The first had exposed rheostat windings on the front of the control panel.
The RORD uses early one amp tubes. A "00" type tube for the detector and two "01" tubes, one for each stage of amplification.
This version 420 Model 6 has colorful bakelite knobs. Another version, 421, has metal dials.
The Model 6 was designed to use four 01A tubes. The tubes pictured here are the fairly rare Montgomery Wards Airline Gold tubes.
The gold Magnavox M1-A speaker makes the perfect match for this version of the Model 6.
This Freshman 5F5 is the early model with windows and no "C" power necessary to run. This is the first radio in the museum collection to have an internal speaker. There is a jack for headphones and another one for an external speaker.
The 5F5 is a "Tuned Radio Frequency" receiver. It has three AM circuits.
This early edition 5F5 uses five 01A tubes, a later version of this model use a 112 tube in the amplifier circuit and a bias voltage (C power) was added.
It wasn't too hard for Atwater Kent to bring out the model 12, it's basically a model 10 with an extra audio amplifier stage. Back in the 20s you bought this one for bragging rights.
The 4910 model 12 exchanged the detector/two stage amplifier for a detector/single stage unit followed by a two stage amplifier unit.
The follow up to the 4910 model 12, the model 12B had an additional potentiometer on the left hand side next to the first variable condenser. Find out more in our video - Atwater Kent Model 4620 12B - YouTube
The CR-12 is a medium wave receiver with two stages of amplification.
This receiver can use either 01A or 99 type tubes. The four small switches next to the filament voltage controls change the filament voltage to accommodate the 01A or the 99 type tubes.
Like other Grebe radios, the CR-12 is coveted by antique radio collectors.
First sold in 1922 under the Radio- Craft label.
Antenna set-up and operating instructions were inside the lid.
The D-4 is a one tube, TRF radio with regeneration. A matching two stage amplifier, the D-5 was introduced the following year (1923).
It's not clear when Radio-Craft was founded, but advertisements for their radios have been found dating from September 1920.
The D-5 is a two step amplifier designed to use 01A tubes. The transformers are often replace by collectors since their failure in early 20s radios is a common problem. The D-5 pictured here has the original transformers.
By 1921 Radio-Craft was a failing company. DeForest Radio Telephone & Telegraph Company bought Radio-Craft in 1922 in order to acquire that company's Armstrong license so they could legally build regenerative radios.