hi chris
think these ones are usually badged logik, but its a common problem, you will just have a dicky transformer, measure both secondary windings on all the transformers and look for the odd one out.
nice easy fix, sure you will have an old dafron board somewhere to nick a transformer off, don’t worry if the numbers are not exactly the same as long as the resistance of the windings are close they don’t seem to be to fussy.
good luck
daz
ps need a bit for a 19 inch technosonic(see parts to buy post) don’t suppose you have one in your tardis like loft?