I have the units Doug sells. They are correct-spec for a Tweed in either laydown or standup styles. The Laydown comes in multi-tap primaries for different voltages. Doug also sells chassis, components and has a great amp-builders forum and technical referrence info as well as board building supplies on his page.
Plus his service is extremely fast - it's all he does.
Look here:
http://www.hoffmanamps.com