And Bob has come through with the schematics! He's even included a parts list. All that's missing from the parts list are the transformers, the power sockets, valve sockets and valves. They're all things that are pretty freeform and depend on what you can source locally.
For builders in the UK, the transformers and valve bases can be bought from Ampmaker. I'll do a bit of research for other countries and post up some suggested sources here.
But before we go any further, here's the disclaimer!
Building and modifying amplifiers is DANGEROUS (like most fun things). Valve amplifiers invariably contain both very high voltages and high currents, capable of killing you. Never work on a live amplifier!
This blog is here to share information about a particular amplifier project. It is up to you to exercise caution and common sense at all times to avoid electrocuting yourself, and make your amplifiers safe to use. I am not responsible for your negligence. Building valve amplifiers is also more addictive than nicotine; you have been warned.
Now, here's a link to a PDF that has the schematics and suggested parts list.
And the pics below are what you get in the PDF. If you'd rather not download the PDF, clicking on any of the pics will open them full size.