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Hearing Aid J2

Hearing Aid J2; Amplivox Ltd.; (ID = 1870578) Misc Hearing Aid J2; Amplivox Ltd.; (ID = 1870579) Misc
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Hearing Aid J2; Amplivox Ltd.; (ID = 1870578) Misc
Amplivox Ltd.;: Hearing Aid J2 [Misc] ID = 1870578 423x467
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For model Hearing Aid J2, Amplivox Ltd.; Kidlington (Oxfordshire):
From 'Wireless World', Vol. 60, Marh 1960, p. 149.
 
Country:  Great Britain (UK)
Manufacturer / Brand:  Amplivox Ltd.; Kidlington (Oxfordshire)
Year: 1954 ? Category: Miscellaneous (Other, Various) - see notes
Semiconductors (the count is only for transistors) 1:
Details Hearing aid
Power type and voltage Dry Batteries
Loudspeaker - only for Earphone!
Power out
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.)

Model page created by Karl Dilcher. See "Data change" for further contributors.



All listed radios etc. from Amplivox Ltd.; Kidlington (Oxfordshire)
Here you find 2 models, 2 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



  
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