22-10-2021, 07:06 PM
Took a closer look at some of the transformers this evening.
The audio output transformer appears to be OK.
But the two mains transformers will need some attention.
The HT transformer will need the lead out wires replacing as their insulation is crumbling. Reading other restorations of 54's this appears to be a common problem.
It looks like the transformer needs to come out and laminations dismantled to replace the wires.
The HT and heater windings look OK on an Ohm meter but I will need to get it out and separated from the EHT transformer to check the primary properly.
The EHT transformers EHT winding is open circuit.
The EHT transformer is wound on a split bobbin with the EHT winding on one section.
So if the other windings on it are OK I might get away with just rewinding the EHT winding.
Frank.
The audio output transformer appears to be OK.
But the two mains transformers will need some attention.
The HT transformer will need the lead out wires replacing as their insulation is crumbling. Reading other restorations of 54's this appears to be a common problem.
It looks like the transformer needs to come out and laminations dismantled to replace the wires.
The HT and heater windings look OK on an Ohm meter but I will need to get it out and separated from the EHT transformer to check the primary properly.
The EHT transformers EHT winding is open circuit.
The EHT transformer is wound on a split bobbin with the EHT winding on one section.
So if the other windings on it are OK I might get away with just rewinding the EHT winding.
Frank.