Frequency range: 25 to 1,000 KHz in three steps - 25 to 200; 100 to 600 and 300 to 1,000 KHz respectively.
Filament battery: 6 volts
Plate voltage: From 60 volt battery
Comment: Six out of the seven tubes were type V24 and used as high frequency amplifiers. Type Q valve was the detector. Widely use in marine work.
|Type 55 front view|
|Type 55 rear view|
|Type 55 schematic diagram. Download image to enlarge,|
Contributors and Credits:
1) Lewis Bodkin <05bodkin555(at)gmail.com>
2) Handbook of Technical Instruction for Wireless Telegtaphists