• Year
  • 1923 ?
  • Category
  • Loudspeaker, headphone or earphone
  • Radiomuseum.org ID
  • 186310

 Technical Specifications

  • Wave bands
  • - without
  • Power type and voltage
  • No Power needed
  • Loudspeaker
  • Horn
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Thorola No. 4 - Winkler-Reichmann Co.; Chicago
  • Shape
  • Tablemodel, high profile (upright - NOT Cathedral nor decorative).
  • Notes
  • The Thorola loudspeaker No. 4 has a gooseneck horn.
  • Price in first year of sale
  • 25.00 $
  • External source of data
  • ad QST September 1925, page 83.
  • Source of data
  • - - Manufacturers Literature
  • Literature/Schematics (1)
  • Radio Horn Speaker Encyclopedia, Floyd A. Paul, p. 74
  • Literature/Schematics (2)
  • Radio Broadcast, Jan. 1926, p. 349
  • Author
  • Model page created by Ernst Erb. See "Data change" for further contributors.

 Collections | Museums | Literature


The model Thorola is part of the collections of the following members.


Forum contributions about this model: Winkler-Reichmann Co: Thorola No. 4

Threads: 1 | Posts: 3

Hello to all. I am a novice trying to restore a Thorola Model 4 horn speaker that goes with my Thorola Model 55 radio and have two questions.

I need to rewind the wire on the coil that sits in the magnets in the base of the speaker. I have checked info in the museum and it seems these types of speakers are 1k, 2k, or even 4k ohms. What should the resistance be on this speaker?

Secondly, if I rewind the coil and the resistance is "low" can I add a resister to bring it up to the correct value? I'm planning on rewiring it with as much #28 wire as I can get on there. Or should I use #32 or #40?

It appeares that someone had taken this apart before because the inside of the base is a mess. The original wire on the coil had come unwound because the spool was broken so there was no way to measure the original resistance. The original wire is extremely fine.


Al Amato, 17.Aug.16

Weitere Posts (3) zu diesem Thema.