09-05-2019, 08:50 AM
(This post was last modified: 09-05-2019, 08:55 AM by boater sam.)
More progress today.
Succeeding with the IF cans spurred me on, terrible weather so inside today, the work on the boat will have to wait.
Removed the Imposter Output Transformer, its a Radiospares universal which I have not seen before. Obviously quite old, grey painted, lots of terminals.
Removed and stripped the original, unwound and counted turns, 3000 in the primary, 1600 in the feedback winding so its a lot of copper. Laminations very tight in the bobbin with some rusting.
Found a bit of greenspot winding corrosion on the corners of the bobbin on the start of the primary, its not burnt at all.
Patiently rewound it with new 0.07 wire, reused the speaker secondary winding wire as it is fine and I didn't have any new of the same gauge, the bobbin is very full. New lead out wires and cleaned up the tag strip.
Reassembled and insulation tested, its a goer.![[Image: thumbsup.gif]](https://www.vintage-radio.net/images/smilies/thumbsup.gif)
That's 3 hours, start to finish, a record for me.
Still pondering on the plastic trim moulding,![[Image: shrug.gif]](https://www.vintage-radio.net/images/smilies/shrug.gif)
its a complicated shape, nothing springing to mind yet. I'll have a go with boiling water but the plastic is degraded and shrunken.
Could try moulding one freehand from Sugru but will cost a lot for a possible failure.
Succeeding with the IF cans spurred me on, terrible weather so inside today, the work on the boat will have to wait.
Removed the Imposter Output Transformer, its a Radiospares universal which I have not seen before. Obviously quite old, grey painted, lots of terminals.
Removed and stripped the original, unwound and counted turns, 3000 in the primary, 1600 in the feedback winding so its a lot of copper. Laminations very tight in the bobbin with some rusting.
Found a bit of greenspot winding corrosion on the corners of the bobbin on the start of the primary, its not burnt at all.
Patiently rewound it with new 0.07 wire, reused the speaker secondary winding wire as it is fine and I didn't have any new of the same gauge, the bobbin is very full. New lead out wires and cleaned up the tag strip.
Reassembled and insulation tested, its a goer.
That's 3 hours, start to finish, a record for me.
Still pondering on the plastic trim moulding,
its a complicated shape, nothing springing to mind yet. I'll have a go with boiling water but the plastic is degraded and shrunken.Could try moulding one freehand from Sugru but will cost a lot for a possible failure.
Boater Sam.
