Major thing I just noticed.....
All my tubes have always had the CCCP logo on the back.
Hi,
As I used to leave in the USSR for a while ;-), there is my knowledge about product quality in the USSR:
CCCP on the item only means Made in the USSR, but if it's inside pentagon shape sign called Sign of quality, then it's almost the best USSR quality product. This sign picture you can see here:
OTK is equals QC (Quality check/control) and virtually all products must have it, but not nessesary it should be seen on the item. It could be in the item passport or User Manual/ datasheet.
Another quality check is the military one. The item, which has passed military check has the highest quality and items/components for military devises could be selected from hundreds or thousands item stock. The problem is that they usually does not have any specific sign, sometimes these items stamped with 2 Russian letters "??"
I hope it helps.
Best regards, Konstantin
www.kosbo.com
