6N16B-V (~6021, 6SN7) USSR Tiny Double Triode Vacuum Tube Gold Grid MELZ. OTK. 7pcs 1961-63

Tubes never used and used old stock, made at MELZ. ( MILITARY OTK. on each tube ) Factory, Soviet USSR
Equivalent to the ~ 6021,6SN7
date: 5 tubes 1961-63 never used and ( 2 tubes used, one 6N16B-i )
Lot of 7 tubes.
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