Radiola Superheterodyne AR-812 "Semi-Portable"
RCA (RCA Victor Co. Inc.); New York (NY)
- Country
- United States of America (USA)
- Manufacturer / Brand
- RCA (RCA Victor Co. Inc.); New York (NY)
- Year
- 1924
- Category
- Broadcast Receiver - or past WW2 Tuner
- Radiomuseum.org ID
- 54765
-
- alternative name: RCA Manufacturing || Victor Talking Machine
Extensive repairs were needed on this set. All circuit elements were in a "catacomb", a tin prism filled with wax, that had to be melted slowly and carefully. All wiring from the catacomb to the terminal strips had to be replaced. The secondary of the second output audio transformer was open, has been replaced by an R-C network. In excellent working condition at this time.
copy to scale ( 110 millimetres Ø) and cut it out. Will fit onto the dial scales under the bezel and circular spring.
RCA AR-812 with its companion speaker UZ1325. First commercially made super-heterodyne. This set is in perfect working condition after extensive work on its chassis. See picture of its interior. The leather/metal handle is a reproduction.
Aus / From NHK Museum Tokyo Japan
RCA advertisement, March 1925
RCA Advertisement, 1924
Click on the schematic thumbnail to request the schematic as a free document.
- Number of Tubes
- 6
- Main principle
- Superheterodyne (common); ZF/IF 50 kHz; 2 AF stage(s); Reflex
- Tuned circuits
- 5 AM circuit(s)
- Wave bands
- Broadcast only (MW).
- Power type and voltage
- Dry Batteries / 2 x 45 or 4 x 22,5 & 6 x 1.5 Volt
- Loudspeaker
- - This model requires external speaker(s).
- Material
- Wooden case
- from Radiomuseum.org
- Model: Radiola Superheterodyne AR-812 "Semi-Portable" - RCA RCA Victor Co. Inc.; New
- Shape
- Portable set > 8 inch (also usable without mains)
- Dimensions (WHD)
- 35 x 11 x 11 inch / 889 x 279 x 279 mm
- Notes
2nd harmonic mixer; two dials (primary tuning control knobs) . "Portable". Self contained loop aerial. Speaker output selectable from V5 or V6.
V1 = RF & 1st IF reflexed.
V2= Oscillator/1st Detector.
V3= IF.
V4= 2nd Detector.
V5= 1st AF.
V6= 2nd AF.Siehe auch Triodensuperhets.
- Price in first year of sale
- 220.00 $
- External source of data
- Ernst Erb
- Source of data
- Radio Collector`s Guide 1921-1932
- Literature/Schematics (1)
- Radio Manufacturers of the 1920's, Vol. 3
- Literature/Schematics (2)
- Radio Broadcast, Mar. 1924, p. 443
- Other Models
Here you find 4961 models, 2930 with images and 4018 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)
Collections
The model Radiola Superheterodyne is part of the collections of the following members.
Museums
The model Radiola Superheterodyne can be seen in the following museums.
Literature
The model Radiola Superheterodyne is documented in the following literature.
Forum contributions about this model: RCA RCA Victor Co.: Radiola Superheterodyne AR-812 "Semi-Portable"
Threads: 3 | Posts: 3
Armstrong explains some of his research work trying to do the first super heterodyne radio viable.
Obtained from a copy of Wireless Age, April 1924, stored in americanradiohistory.com
Attachments
- AR812 development Part I (189 KB)
- AR812 development Part II (199 KB)
Moisés Piedade, 28.Aug.14
The AR-812 is pictured briefly in Fritz Lang's first sound film "M" from 1931.
Mark Hippenstiel, 11.Apr.13
Konrad Birkner † 12.08.2014, 07.Mar.04