P-57 miniature tubes
Automatic Radio Mfg. Co.; Boston (MA)
- Country
- United States of America (USA)
- Manufacturer / Brand
- Automatic Radio Mfg. Co.; Boston (MA)
- Year
- 1957 ?
- Category
- Broadcast Receiver - or past WW2 Tuner
- Radiomuseum.org ID
- 301066
Battery/AC switch detail with callouts.
Click on the schematic thumbnail to request the schematic as a free document.
- Number of Tubes
- 5
- Number of Transistors
- Semiconductors
- Selengleichrichter
- Main principle
- Superhet with RF-stage; ZF/IF 455 kHz
- Wave bands
- Broadcast only (MW).
- Power type and voltage
- Line / Storage batteries (perhaps also batteries) / AC/DC: 105-125 / 3 & 90 Volt
- Loudspeaker
- Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 5 inch = 12.7 cm
- Material
- Leather / canvas / plastic - over other material
- from Radiomuseum.org
- Model: P-57 [miniature tubes] - Automatic Radio Mfg. Co.;
- Shape
- Portable set > 8 inch (also usable without mains)
- Dimensions (WHD)
- 290 x 220 x 119 mm / 11.4 x 8.7 x 4.7 inch
- Notes
-
There is also a pre-war model Automatic P57 with octal tubes.
Case is trapezoidial. Depth at the top is 97mm.
- Mentioned in
- Photofact Folder, Howard W. SAMS (Set 489 folder 4 date 6-60)
- Other Models
-
Here you find 401 models, 163 with images and 321 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Automatic Radio Mfg. Co.; Boston (MA)
Collections
The model P-57 is part of the collections of the following members.
Forum contributions about this model: Automatic Radio Mfg.: P-57
Threads: 2 | Posts: 6
The P57 was acquired through eBay auction for US$ 23.50 plus US$ 25.98 shipping, $49.48 total. Item # 372304847449
As received, the radio was not operational and was missing the 3V4 audio output tube. Replaced the missing tube, paper tubular capacitors and all but one of the electrolytic capacitors. Repaired a damaged RADIO/CHARGE slide switch, which had been sprung apart. The radio now works as I remember the one my family had in the 1950's.
Jean
Jean de Bellefeuille, 14.Jun.18
The date on this model is shown as 1959 ?. My family bought a new one of these models in 1957. The one they purchased had 7-pin miniature tubes. 1U4, 1R5, 1T4 or 1U4, 1U5 and 3V4. So, I'm suggesting to list the Year as 1956 or 1957.
Jean de Bellefeuille, 21.May.18