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Luxman1050 · 4th Oct 2019, 9:35 pm

Okay to be honest not sure which is the right way round not come across one of these before. I did put new flex and plug on with 3 amp fuse. I've connected it so the live is going to the upper mains input pin and negative the bottom pin. Is that the right way round? I've noticed on the voltage selector you have 3 sine waves at top and below that 3 straight lines is that an indication where live and negative should be? Again usually you just have the figures to choose from.

Mind you come to think of it I tried to wind it up on a variac and even at 220v nothing. But on measuring the bottom pin which is where I have connected -ve was reading the input voltage from the variac whereas from the positive nothing?

It only lit up when I plugged it straight into the mains the variac obviously does not work on this type of unit without a transformer. I suppose it must have something to do with those thermistors not sure.

I don't have a service manual in English so difficult to decipher.

4th Oct 2019, 9:35 pm	#61
Luxman1050 Octode Join Date: Apr 2019 Location: Margate, Kent, UK. Posts: 1,728	Re: Philips BX281U20 valve radio Okay to be honest not sure which is the right way round not come across one of these before. I did put new flex and plug on with 3 amp fuse. I've connected it so the live is going to the upper mains input pin and negative the bottom pin. Is that the right way round? I've noticed on the voltage selector you have 3 sine waves at top and below that 3 straight lines is that an indication where live and negative should be? Again usually you just have the figures to choose from. Mind you come to think of it I tried to wind it up on a variac and even at 220v nothing. But on measuring the bottom pin which is where I have connected -ve was reading the input voltage from the variac whereas from the positive nothing? It only lit up when I plugged it straight into the mains the variac obviously does not work on this type of unit without a transformer. I suppose it must have something to do with those thermistors not sure. I don't have a service manual in English so difficult to decipher.