[morzh]

Well, yes, all the radios, even those built in 70s, had 110/220V switch since there were still some nooks even in 70s.

Before the WWII most places were 110-127V.

Americans did consult the largest hydroelectric plants' projects in 20s. The famous DneproGES (Dnieper Hydroelectric Plant, now in Ukraine) was consulted by Hugh Cooper.

http://en.wikipedia.org/wiki/Dnieper_Hyd...ic_Station
http://en.wikipedia.org/wiki/Hugh_Cooper

When I was growing up, I saw in 70s last 110-127V strongholds disappear, but even in 80s one could see all electronic and electrical equipment having switches for 127V (even electric shavers).


As for the vacation, if you indeed plan go there (not just for radios), sure, this may be your best bet to pick up some good equipment.

Daugava was built at A. Popov Riga Radio factory (Latvia).