While in Vladivostok, Siberia, we asked our tour guide to take us to a music store so I could purchase a set of balilika (spelling?) strings for my wife's friend, The strings cost three one hundreths of a U.S. penny apiece.
At that price I suggested, "Aw hell, let's get him two sets."
I played some Russian 6-string guitars that were so bad that I lack the profanity to describe them and then my eye fell on two tubas. Cool!
They were Russian Army issue Eb upright, rotary tubas in what looked like new condition. The store was out of valve oil but I could bugle on the thing and tell that it might be playable. Intonation was so-so. No name on the bell. Price, 10,000 Rubles ($10 U.S.with no case-they put it in a canvass sack) Why not?
Alaska Airlines badly rumpled the bell after I let them talk me into checking it but it sounded the same so I oiled it up and the slow, clanky rotors would work only after I warmed the horn up fo 30 minutes or more.
I played the thing while my wife held a telephone down the bell and I won a prize on the John Boy and Billy Big Show on the radio.
A couple of years later I played along with John Reno's guitar/vocals and he enjoyed it so we began gigging together. Parts would suddenly fall off the rotary valves and John and I would be down on our knees on the band stand looking for some tiny bolt that had to be metric or carving up wine corks and using Gorrila Glue to make new stoppers. The brass was thin as paper and the rotors were so slow, we decided another tuba was the answer.
I lucked up on my 1940 King Eb recording tuba on E-bay and I have been as happy as a pig in poop ever since.

I gave the Russian p.o.s to John to hang on his wall after making him promise to warn anybody who may want to play it how crummy it is.