Yesterday my GEC 2028 disgraced itself by failing to display any sort of picture so if there any spare time tomorrow I'll take look at it to find out what has gone wrong with it.
This dual standard set was hard wired to 625 only. Also, after the original line output transformer burnt a single standard 2040 line output transformer was fitted as the replacement. I now have the correct dual standard LOPTx but because the fact the set is hard wired for 625 only it might be considered not be worth the bother replacing the transformer again.
All the system switches were removed sometime in the seventies. An attempt to improve reliability.
Till Eulenspiegel.