Radiotrola Baby Grand
National Airphone Corp.; New York (NY)
- Country
- United States of America (USA)
- Manufacturer / Brand
- National Airphone Corp.; New York (NY)
- Year
- 1924/1925
- Category
- Broadcast Receiver - or past WW2 Tuner
- Radiomuseum.org ID
- 129916
Restored to working condition
From the collection of Merrill Bancroft.
Click on the schematic thumbnail to request the schematic as a free document.
- Number of Tubes
- 1
- Valves / Tubes
- WD12
- Main principle
- TRF (Tuned-Radio-Frequency but use of regeneration unknown)
- Tuned circuits
- 1 AM circuit(s)
- Wave bands
- Broadcast only (MW).
- Power type and voltage
- Dry Batteries
- Loudspeaker
- - For headphones or amp.
- Material
- Leather / canvas / plastic - over other material
- from Radiomuseum.org
- Model: Radiotrola Baby Grand - National Airphone Corp.; New
- Shape
- Tablemodel, Box - most often with Lid (NOT slant panel).
- Dimensions (WHD)
- 11.25 x 7.15 x 7.25 inch / 286 x 182 x 184 mm
- Notes
-
Improved GT-1 enclosed in cabinet, provided with individual compartments for tubes, batteries and headphones.
The cabinet includes a 20-ohm Rheostat to control A+ filament supply, a 5k-ohm potentiometer to the B+ circuit to control Volume, and a switch to easily disconnect the batteries. Advertisements show use of a tipped WD-12 tube and the distinctive headband used on Dictograph headsets, such as the Dictograph R-3 3000-ohm headset shown in the photo. The battery compartment will hold one standard 1.5 volt A cell and one 22.5 volt B battery. The GT-1 is different from standard GT-1 units, with two long studs on the bottom to secure it into the cabinet. Power wires come through from under the GT-1 and connect to side posts. Aerial and ground connect to the top posts, and phones to the bottom posts, of the GT-1, as usual.
- Net weight (2.2 lb = 1 kg)
- 1.8 kg / 3 lb 15.4 oz (3.965 lb)
- Price in first year of sale
- 18.50 $
- Source of data
- The Radio Dealer
- Mentioned in
- Radio News 11/1924
- Literature/Schematics (1)
- October 1924 The Radio Dealer magazine advertisement page 7
- Author
- Model page created by Otto Frosinn. See "Data change" for further contributors.
- Other Models
-
Here you find 15 models, 13 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from National Airphone Corp.; New York (NY)
Collections
The model Radiotrola is part of the collections of the following members.