A few pictures of my newly arrived H12G below. Originally inspired by Parallax PL519, but has manifested as very much a screen drive amp in its own right..
OTL, dual mono, class A, triode strapped 6E5P as driver, screen driven 6P45S as power, auto-bias, TKD 2CP-2511 potentiometer, pre-out, min. recommended HP-impedance 100Ω, chassis 30x30 cm, weight 8.5 kg
The simple no-nonsense look works for me personally, but I suspect some will find it a bit boring. Also, this amp is not really intended for tube rolling, people with that inclination will be better served elsewhere.
As the amp only arrived a few days ago, and having limited previous OTL-experience, I need a bit of time with the amp, before I will comment on the sound. The headphones I plan to use are AKG K240DF|K340|K400|K500 and Beyerdynamic T70, and I will probably seek out others to try as well.
This being the very first Eufonika second grid amp, the model was named H12G. Wieslaw has already build a second unit for one of his regular customers, and intend to built a third unit for himself to further experiment with and improve upon the design.