I have taken a photo of the BR40 chassis and it is very similar except for the mains transformer.
Unless KB used a faulty BR40 to adapt, it makes me think the transformer in this BR40T has been a service replacement at a later time.
BR40T on the left, BR40 on the right
Often on a tropicalised KB radio (with a T suffix) the mains transformer would have taps from 100v to 250v but the domestic BR40 already had the full range of voltage taps.
The BR40T has a different RF amplifier valve a 6SG7, whereas the BR40 had a 6K7G
The other main differences in the 2 radios are that LW on the BR40T has been replaced by a SW band covering SW 40m to 94m (7.5 to 3.2MHz)
The other bands are;
Medium Wave 195 to 560m (1540 to 535 kHz)
31m band (9.85 to 9.35MHz)
25m band (12.1 to 11.5MHz)
19m band (15.69 to 14.95MHz)
16m band (18.2 to 17.4MHz)
13m band (22.1 to 22.0MHz)
The Domestic BR40 wave bands are as follows;
MW band (1540 to 535 kHz)
LW band (400 to 135 kHz)
49m band (6.28 to 5.92MHz)
31m band (9.85 to 9.35MHz)
25m band (12.1 to 11.5MHz)
19m band (15.69 to 14.95MHz)
16m band (18.2 to 17.4MHz)
Unless KB used a faulty BR40 to adapt, it makes me think the transformer in this BR40T has been a service replacement at a later time.
BR40T on the left, BR40 on the right
Often on a tropicalised KB radio (with a T suffix) the mains transformer would have taps from 100v to 250v but the domestic BR40 already had the full range of voltage taps.
The BR40T has a different RF amplifier valve a 6SG7, whereas the BR40 had a 6K7G
The other main differences in the 2 radios are that LW on the BR40T has been replaced by a SW band covering SW 40m to 94m (7.5 to 3.2MHz)
The other bands are;
Medium Wave 195 to 560m (1540 to 535 kHz)
31m band (9.85 to 9.35MHz)
25m band (12.1 to 11.5MHz)
19m band (15.69 to 14.95MHz)
16m band (18.2 to 17.4MHz)
13m band (22.1 to 22.0MHz)
The Domestic BR40 wave bands are as follows;
MW band (1540 to 535 kHz)
LW band (400 to 135 kHz)
49m band (6.28 to 5.92MHz)
31m band (9.85 to 9.35MHz)
25m band (12.1 to 11.5MHz)
19m band (15.69 to 14.95MHz)
16m band (18.2 to 17.4MHz)
