Yes, this was real pleasure to build. You can purchase it from digikey.com. Or tubedepot.com. This amp will accept both the 300b or 2a3 power tubes and preamp tubes either 12au7 or 12bh7. Lots of tube rolling options.
I have both 300b and 2a3 tubes. Both sound amazing compared to solid state amplifiers. The blue glow is some sort of gas in it, and not a full vacuum state. I presume these tubes won't last long. When i test them on my tube tester, they peg the needle over 100mA. The pre-amplification can use either 12au7, or 12bh7. So, there are lots of tube rolling opportunities.
