Need help identifying Russian tube amplifier

Against the advice of several local guys who know a lot more than I, I purchased this amplifier. It is a 30-35 wpc integrated.  Their concern was that the transformer quality is unknown and that there are no schematics. Their advice is probably appropriate because it wasn't that cheap.  All writing on it is in Russian except for the words "Moonrower; made in Moscow" printed on a small paper sticker glued to the rear of the chassis.  The chassis has a large footprint, is very heavy and is painted black with a chrome plated or polished SS transformer cover with pedestal feet at the four corners. The seller recapped it and replaced the 4 output tubes with the others as follows:

4X Mullard 6L6gC;  Amperex 2X 6DJ8;  Amperex 2X EF86

my main amp is the Cary 808R (Rocket 88R) with which I've been ver happy. Even though there is a somewhat difference, I appreciate this one almost at the same level. I don't have any thoughts that I've lucked into the holy grail of obscure Russian amps; I'm just very curious.