I have done a complete recap, changing all the wax paper capacitors, and electrolytics, the radio is now working, got a few other things to check.
The mains transformer gets a little warm after an hour, not too hot to touch, but I think it is slightly underside for the number of valves..
The Magic eye was very dim but I happened to find a NOS 6U5 on the shelf which is nice and bright.
The tuning drive cord is a little slack and I need to dismantle it to clean some rust of the large capacitor drum and the capstan, so have dismantled the dial screen to get at it.
This is the 6SG7 socket connections, so it appears KB didnt use the 2nd cathode connection.
There are a few differences in the radio to the schematic I have for the BR40T. The schematic shows an additional winding on the output transformer. The schematic is now in the KB museum website. http://kbmuseum.org.uk/kb_service_manual...0T_cir.pdf
But I cant see this winding in the radio, just looks like primary and secondary wires.
I have taken a photo of some alterations that have been made to one of the LW coils. I assume this was this the testing and modifications done by KB.
Mike
The mains transformer gets a little warm after an hour, not too hot to touch, but I think it is slightly underside for the number of valves..
The Magic eye was very dim but I happened to find a NOS 6U5 on the shelf which is nice and bright.
The tuning drive cord is a little slack and I need to dismantle it to clean some rust of the large capacitor drum and the capstan, so have dismantled the dial screen to get at it.
This is the 6SG7 socket connections, so it appears KB didnt use the 2nd cathode connection.
There are a few differences in the radio to the schematic I have for the BR40T. The schematic shows an additional winding on the output transformer. The schematic is now in the KB museum website. http://kbmuseum.org.uk/kb_service_manual...0T_cir.pdf
But I cant see this winding in the radio, just looks like primary and secondary wires.
I have taken a photo of some alterations that have been made to one of the LW coils. I assume this was this the testing and modifications done by KB.
Mike
