I've had a few torroidal transformers from Terry at Canterbury Winding's and they have all been quiet and excellent quality
My mains varies between 240 -250 so I always ask him for 240V primary, Goss band and electrostatic screen
http://www.canterburywindings.co.uk/standard_range.html
Those Torroidy ones look very well made may try some of them on my next amp build
Alan
Turntable - Garrard 401/Jelco 750L/Ortofon Kontrapunkt B, Pioneer PLC 590, Micro Sieki MA505 , Denon DL103R - DIY Paradise Phono stage - Reel 2 Reel Studer A810, Otari MX55,Tascam BR20, Revox A77, B77, PR99, TEAC X1000 & 3440, Digital HTPC / Young Dac - Preamp - DIY B4, 821, Power Amp's DIY Avondale NCC300 Mono Block, Speakers Wilmslow Kit Volt BM220.8 / Scanspeak D2905/9500