[R-390] Foreign tubes 12ax7 (r390/r388)

[g kwitka]

This is a technical slightly off topic question. 
I have an r-388 in addition to my r-390a.
Does anyone have any experiance with Russian or
Chinese tubes that will replace the 12ax7.  The US
made NOS stock tubes are getting to be quite
expensive.
 Ibeleive the  r390 uses a 12ax7 so I am hoping
someone has experiance.
 (please no political commentary)


		
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