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7-A Peerless Magnetic Reproducer

7-A Peerless Magnetic Reproducer ; United Radio (ID = 898221) Speaker-P
 
7-A Peerless Magnetic Reproducer ; United Radio (ID = 898222) Speaker-P
 
7-A Peerless Magnetic Reproducer ; United Radio (ID = 898223) Speaker-P
 
7-A Peerless Magnetic Reproducer ; United Radio (ID = 898224) Speaker-P
 
7-A Peerless Magnetic Reproducer ; United Radio (ID = 898225) Speaker-P
 
7-A Peerless Magnetic Reproducer ; United Radio (ID = 898226) Speaker-P
 
7-A Peerless Magnetic Reproducer ; United Radio (ID = 898227) Speaker-P
 
7-A Peerless Magnetic Reproducer ; United Radio (ID = 2251327) Speaker-P
7-A Peerless Magnetic Reproducer ; United Radio (ID = 831747) Speaker-P 7-A Peerless Magnetic Reproducer ; United Radio (ID = 831748) Speaker-P
7-A Peerless Magnetic Reproducer ; United Radio (ID = 831749) Speaker-P 7-A Peerless Magnetic Reproducer ; United Radio (ID = 831750) Speaker-P
7-A Peerless Magnetic Reproducer ; United Radio (ID = 831751) Speaker-P 7-A Peerless Magnetic Reproducer ; United Radio (ID = 831752) Speaker-P
7-A Peerless Magnetic Reproducer ; United Radio (ID = 831753) Speaker-P 7-A Peerless Magnetic Reproducer ; United Radio (ID = 138496) Speaker-P
7-A Peerless Magnetic Reproducer ; United Radio (ID = 138503) Speaker-P 7-A Peerless Magnetic Reproducer ; United Radio (ID = 138505) Speaker-P
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7-A Peerless Magnetic Reproducer ; United Radio (ID = 831747) Speaker-P
United Radio: 7-A Peerless Magnetic Reproducer [Speaker-P] ID = 831747 773x930
Select picture or schematic to display from thumbnails on the right and click for download.
For model 7-A Peerless Magnetic Reproducer, United Radio Corporation (Peerless); Rochester NY:
Front view
ebay #300474242504
 
Country:  United States of America (USA)
Manufacturer / Brand:  United Radio Corporation (Peerless); Rochester NY
Year: 1928/1929 Category: Loudspeaker, headphone or earphone
Wave bands - without
Details
Power type and voltage No Power needed
Loudspeaker Magnetic loudspeaker (reed) generic.
Power out
from Radiomuseum.org Model: 7-A Peerless Magnetic Reproducer - United Radio Corporation
Material Wooden case
Shape Table-Cathedral-Type (upright, round top or gothic arch, not rounded edges only).
Dimensions (WHD) 292 x 328 x 182 mm / 11.5 x 12.9 x 7.2 inch
Notes

The logo says: "Peerless Reproducer - Manufactured by United Radio Corp., Rochester, NY, USA".  Peerless used parchment cones.  This speaker is essentially identical to the 7-A Peerless Magnetic Reproducer that was manufactured by the successor company United Reproducers Corp.

There are two key patents for the Reproducer. Number 1,726,524, filed in July 1927, covers the design of an annular of freely flexible inelastic material. Igor Bobrovsky, the inventor, claimed that the ring improved sound quality of the cone. The ring is clearly visible between the beige paper cone and black steel frame. The second patent, filed in June 1927, is for a speaker with a U-shaped permanent magnet that surrounds an actuating winding. The winding drives a piston that connects to the speaker cone, producing sound. Bobrovsky filed the patent application and claimed that the actuating winding vibrates an “armature” connected to a “driving rod” connected to the cone. A lever provides a 3:2 ratio of driving rod movement compared to the armature movement.

Isaac Harris of Buffalo NY designed the box and filed a patent application in March 1928.

Note that some of the model pictures show a "C" rather than an "A" on the cone.  These are Series designations.  The "C" model is still believed to be a model 7-A.

Price in first year of sale 30.00 $
Mentioned in Classic Cones (page 66)
Literature/Schematics (1) Chicago Salvage Stock Store catalogue, 1928?
Literature/Schematics (2) Radio Broadcast Magazine (Oct. 1927, Page 370)

Model page created by Alessandro De Poi. See "Data change" for further contributors.



All listed radios etc. from United Radio Corporation (Peerless); Rochester NY
Here you find 7 models, 5 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




  
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