Frequency range: HF -  between 15 and 75 metres.
Modes:  CW and ICW (MCW)
Power output:  100 watts on CW;  less on ICW
Frequency control : Assumed to be crystal.
Comment: The image shows a microphone attached to the transmitter. This suggests that the TN19A had voice capability as well .

Image provided by the Marconi Review, Dec 1931.

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Credits and Contributors:

1) Marconi Archive, Bodleian Library, Oxford
 

June 27/24