I took a look at the Lomo PSU ,
Thats first class gear if you ask me , theres heavy mu-metal sheilds on the transformers ,
everything is massively overated in terms of the power it delivers ,
Its not unlike a Neumann tube mic psu of the NT variety ,
Curious that the designers chose to locate the audio transformer at the PSU end , so the anode ends up driving the line , that cable and its associated capacitance forms a filter on high end the responce ,
so its all part of how its voiced in the end ,
Theres a few other variations on the 19A9 , well worth checking out .
I'm a little sad to hear from our Russian friends Lomo is pretty much forgotten there , perhaps it only serves to bring back memories of times people would rather forget ,
Its good gear though , military grade tough , a bit more utilitarian than their West German counterparts , you could hammer nails all day with it and it would still work .
I wouldnt mind getting my hands on a couple of Lomo pre's , as was the way back then they were only speced from around 50hz-15khz audio bandwidth ,
They also seem to use 250 ohms input matching , not what you want in a modern context ,
https://groupdiy.com/threads/lomo-kinap.79296/