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.
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