Hi, I'm selling a DIY made Preamplifier based on the Ale Moglia's project, here is the schematic: http://www.bartola.co.uk/valves/2017/06/25/4p1l-4%D0%BF1%D0%BB-siberian-gen4-dht-preamplifier/
It has the Rod Coleman Filament Regulator, Paper-in-oil Power_Supply caps, Russian coupling caps and the sound is fantastic! It has about 40 hours consumed for music so you could say it's like new. The top case was taken and adapted from an old MSB DAC, it has some imperfections but nothing to worry about. It will be very well packed. Ask for shipping costs, please, if you are interested. It has the 230V Power - for Europe.