Hi
Thanks guys for your comments, Jeffrey, the 530 is a lot later, I have Paul's CD of service data, I presume that includes all of the Trader service manuals.
The earliest Trader I can see is for the KB 333 of about 1933, the 279 is from about 1931.
The WW article I have does have the schematic and layout drawings, but no components have their value marked. Anyway I have now worked my way through the radio noting the value of each component and updating the WW schematic with my findings.
There have been one or two difficult problems on the way, mainly by the fact that I believe the WW schematic was done from the original design schematic, but in production a few changes were made.
I had to smile when I saw the WW drawings of the layout under the chassis, it was all neatly laid out with neatly bundled cable looms and tag board for the components. My radio is the usual rats nest, but that is probably a bonus as it makes tracing the circuit easier if the wiring is not in tied looms.
When I have the radio working I will publish my edited WW schematic on my website, just in case another of these rare radios turns up and someone wants the information.
The valves in this set are supposed to be AC/S2 AC2/HL PM24B & 1807, what is actually there is S4V3 AC2/HL PM24M and a Cossor rectifier with a rather obliterated number, looks like it could be 2870 and it also has EUU on the other side. The heaters all test as OK, so I am hoping they will work.
Rather than keep posting on 2 sites, if anyone wishes to follow my progress, my thread on the KB 279 is here.
http://www.vintage-radio.net/forum/showt...p?t=133804
thanks
Mike
Thanks guys for your comments, Jeffrey, the 530 is a lot later, I have Paul's CD of service data, I presume that includes all of the Trader service manuals.
The earliest Trader I can see is for the KB 333 of about 1933, the 279 is from about 1931.
The WW article I have does have the schematic and layout drawings, but no components have their value marked. Anyway I have now worked my way through the radio noting the value of each component and updating the WW schematic with my findings.
There have been one or two difficult problems on the way, mainly by the fact that I believe the WW schematic was done from the original design schematic, but in production a few changes were made.
I had to smile when I saw the WW drawings of the layout under the chassis, it was all neatly laid out with neatly bundled cable looms and tag board for the components. My radio is the usual rats nest, but that is probably a bonus as it makes tracing the circuit easier if the wiring is not in tied looms.
When I have the radio working I will publish my edited WW schematic on my website, just in case another of these rare radios turns up and someone wants the information.
The valves in this set are supposed to be AC/S2 AC2/HL PM24B & 1807, what is actually there is S4V3 AC2/HL PM24M and a Cossor rectifier with a rather obliterated number, looks like it could be 2870 and it also has EUU on the other side. The heaters all test as OK, so I am hoping they will work.
Rather than keep posting on 2 sites, if anyone wishes to follow my progress, my thread on the KB 279 is here.
http://www.vintage-radio.net/forum/showt...p?t=133804
thanks
Mike
