The transformer screen and the chassis/case should be connected to earth ground/safety ground/protective earth. The chassis connection should be done in such a way that it is very unlikely to break. e.g. use shakeproof washers
The signal ground should have one and only one direct connection to safety ground, somewhere in your system. Elsewhere, it can have an indirect connection via a big low value resistor or a shorted rectifier bridge. Details are available in a number of places.
this is what i practice....
Sorry, your thread got hijacked. What is it you are still unclear about?Can someone help me?
What is it you are still unclear about?
I still don't understand which wires of the primary wing I have to connect to mains. Tried with blue and brown but it seems this does not work.
Transformer was tested inside the radio and it was perfectly working giving the values I wrote in my first post. Checked with a DMM for continuity and it seems that mains were connected with blue and yellow but I'm not sure because there was a tube between plug and transformer and the voltage selector was a bit too much a jumble. Then I have cut the wires and tested according Andrew suggestions so there is no reason why he ought not to work. Andrew said that blue wire could be an electrostatic screen between primary and secondary.
He said the blu to brn is 59r.
He also said the blu to brn is the highest resistance of the primary winding.
Yes it is, just checked again.
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Sorry, I thought it was omitted from the list of resistances. If resistance looks OK, but a lamp limiter glows with an unloaded transformer then you probably have a shorted turn in one of the windings.
I do not understand. Worked perfectly before cutting the wires
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