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What type is the smaller, metal tube? "OTK2" is not a tube type, it's a stamp that Soviet manufacturers used to indicate that the tube had passed quality inspection for military use ( (odboru technicke kontroly). That means we don't know what type the smaller metal tube is. Is it a pentode? Triode? Other?
The headfonia.com reviewer wrote that the input tube is a 5693, which is an industrial version of the 6SJ7. That means it's an old metal pentode.
The output tubes are a Chinese version of the good ol' 6AS7G or 6080 (low mu twin-triode designed for use as the pass tube in a voltage regulator).