Hearing Aid J2
Amplivox Ltd.; Kidlington (Oxfordshire)
- Country
- Great Britain (UK)
- Manufacturer / Brand
- Amplivox Ltd.; Kidlington (Oxfordshire)
- Year
- 1954 ?
- Category
- Medical Technology
- Radiomuseum.org ID
- 272264
- Number of Transistors
- Semiconductors present.
- Semiconductors
- Main principle
- Audio-Amplification
- Wave bands
- - without
- Details
- Hearing aid
- Power type and voltage
- Dry Batteries / Mercury cell: 1 x 1.3 Volt
- Loudspeaker
- - only for Earphone!
- from Radiomuseum.org
- Model: Hearing Aid J2 - Amplivox Ltd.; Kidlington
- Notes
-
Hearing aid with transistor.
Low-consumption valves are used in the voltage-amplifying stages, but the greater part of the normal h.t. current is saved by using the transistor. A reduction from 0.35 mA in the all-valve model J to 0.04 mA in the J2, or a ratio of 120/1000 hours life. A single Mallory mercury cell (1.3 V) is user for l.t. Here the economy is 20 mA to 12.5 mA, or 50 to 80 hours.
Air-to-air gain is 47 dB with E9L high-sensitivity earphone, compared with 53 dB in the all-valve J hearing aid.
- Price in first year of sale
- 44.10 GBP
- Mentioned in
- Wireless World (The), London (WW, 79) (Vol. 60, March 1954, p. 149.)
- Author
- Model page created by Karl Dilcher. See "Data change" for further contributors.
- Other Models
-
Here you find 2 models, 2 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Amplivox Ltd.; Kidlington (Oxfordshire)