• Country
• United States of America (USA)

• Manufacturer / Brand
• RCA (RCA Victor Co. Inc.); New York (NY)

• Year
• 1928–1930

• Category
• Loudspeaker, headphone or earphone

• Radiomuseum.org ID
• 53066

• • alternative name: RCA Manufacturing || Victor Talking Machine

Click on the schematic thumbnail to request the schematic as a free document.

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 25 to 60 cycles, 105 to 125 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 8 inch = 20.3 cm

• Material
• Wooden case

• from Radiomuseum.org
• Model: LOUDSPEAKER 106 UZ-642 [AC] - RCA RCA Victor Co. Inc.; New

• Shape
• Console, Lowboy (legs < 50 %).

• Dimensions (WHD)
• 23.5 x 33.5 x 10.75 inch / 597 x 851 x 273 mm

• Notes

• The RCA LOUDSPEAKER 106 is an electro-dynamic 8" speaker mounted into a cabinet that also contains a tubeless power supply used to generate the DC voltage required for the field coil of the speaker.  The power supply consists of a full wave disk rectifier and Qty(2) 0.1uF capacitors.  The dry disk rectifiers are mounted on the speaker. An output transformer is also mounted on the speaker, which reduces the high input impedance down to a lower impedance needed to drive the speaker. The cable from the output transformer inputs has phone tips used to connect to the output of the receiver.

  A recepticle is provided on the rear of the cabinet and can be used to supply AC power to the receiver that is used in conjunction with the speaker.  A power switch is mounted on the cabinet, with the switch controlling both the speaker power supply and the AC recepticle.

  The loudspeaker is similar to the ones used in Radiola's 62 and 64.

  The LOUDSPEAKER 106 also has a DC model, which is similar to the AC model except has a higher field coil resistance and also does not have the power supply.

  The output voltage from the power supply should be about 80VDC with the field coil connected and about 95VDC with the field coil disconnected.  The operation of the disk rectifiers depends on the pressure which the disks are held.  Slightly tightening the pressure on the disks may improve a low voltage reading from the power supply.

  Note that the schematic in Riders shows both the tubeless type LOUDSPEAKER 106 and also the Speaker/amplifier combination LOUDSPEAKER 105.  These are two distinct loudspeaker models.

• Price in first year of sale
• 88.00 $

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

• Mentioned in
• Radiola, the golden Age of RCA (p.331, 332)

• Literature/Schematics (1)
• RCA Victor Service Notes "Red Book" Series (RCA Victor Service Notes for 1923 - 1928)

• Other Models

• Here you find 5132 models, 3235 with images and 4167 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from RCA (RCA Victor Co. Inc.); New York (NY)