Philips/B6X12A - Power transformer connection (Techniek Radio/TV)

door Matthias Meijer , Dordrecht, 28.02.2011, 14:23 (5018 dagen geleden) @ svetolik
Bewerkt door Matthias Meijer, 28.02.2011, 14:29

The thermofuse is located between the windings of the transformer, and is connected to the eyelets next to the cut-out piece of the frontplate of the transformer (where the black and brown sleeved wire are attached).
You can clearly see two bare tinned wires go between the transformer windings.

Desolder these wires from the eyelets, and you can gently pull it out.

The thermofuse is a small piece of plastic, approximately 15x30mm with two springy wires attached, which are soldered together through a hole in the plastic with a low melting point solder. When the transformer gets too hot, the solder melts, the wires will bend back to their original position and the current cannot flow anymore.

Best regards,

Matthias

EDIT: the two 80mA fuses are probably in the anode current circuit, one for each output tube. The 10A fuse in the filament circuit, and probably the 315mA fuse is in the high voltage circuit, right after the rectifier.
And finally the thermofuse in the primary mains circuit.

The thermofuse has the advantage over a fixed value fuse, because the primary current would be twice as high at 110V than it is at 220V. A different value fuse would then be necessary, which is sometimes the case with certain models of radios where this is CLEARLY indicated on a sticker inside the radio, and often an extra fuse is included. But this is not the case with your radio.