Radio Unit BT2

Radio Unit, BT2

The BT2 has been totally re-designed and will deal with most of the more powerful stations both during the day and after dark.

It consists of a "constant bandwidth" band-pass coupling the aerial to the grid of the first HF   Pentode, followed by a tuned HF transformer coupling to the second HF Pentode.

Screening between each stage is very comprehensive, also de-coupling between high-tension lines. A second tuned HF transformer feeds the diodes of the double diode triode detector and first LF except that one diode is used for AVC purposes the circuit is as BT1 from the detecting diode onwards.

In order that the sensitivity shall remain constant over the entire waveband, a resistance is automatically brought into use on the first valve over the lower wavelengths.

Variable tone correction is employed on radio and is totally changed upon switching over to gram.

Power supply required:  20 mA, 250 volts; 4 volts at 3.6 amps for heaters, etc.

Controls: Tuning,  Tone, Volume, Long, Medium, and Gram switch.

Connections: Speech and Earth - two-pin socket

HT and Heaters: 5-pin plug and socket.

Here you find 56 models, 51 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
All listed radios etc. from Lowther Manufacturing Co; Kent