Hmm S&B lists the newer TX-1003 as 150 GBP a pair. Has anyone heard or read anything about them? That price is a lot more reasonable, I am tempted to try them out.
http://www.stevens-billington.co.uk/pagestepup.htm
"We now introduce the TX1003, a range of 3 smaller versions of the TX103.
These transformers have a winding symmetry based around the original TX103
The TX1003-5 has a 1:5 ratio with a centre tap on its primary
The TX1003-10 has a 1:10 ratio with a centre tap on its primary
The TX1003-20 has a 1:20 ratio also with a centre tap on its primary
All transformers are shielded with an 80% nickel shield and fitted with internal copper foil screens
The TX1003 is priced at