Philips main transformer for BX696A (Algemeen)

door Robert Gribnau, 21.05.2021, 15:09 (1282 dagen geleden) @ Pandu Rajan

Hello Pandu,

Measuring an unloaded transformer often gives a higher voltage than under load.

I doubt if you would reach 255 Vdc after the rectifier with a transformer with 230-0-230 V at the current the radio will take (about 76 mA).

These curves for the AZ1 show that the actual dc voltage after the rectifier depends on both the current that will be taken and the resistance of the transformer (see the formula).

From the curves for 300-0-300 V you can estimate what they will be for 280 V. If R of the transformer is about 300 Ohm, than 280-0-280 V will give about 255 Vdc at 76 mA.

So I think that your transformer is fine.

As far as I know the codes of Philips transformers do not indicate voltages.

Greetings,
Robert