Wolf is correct and not paranoid... the dealer must have a return policy.
NOS can mean New Old Stock or it can also mean the tube was used in a
medical or military component in the 1950s for a short time and then was
put on the market for sale as new. The dealer would be unaware and test
the tube and it may still test as new.
NOS can mean New Old Stock or it can also mean the tube was used in a
medical or military component in the 1950s for a short time and then was
put on the market for sale as new. The dealer would be unaware and test
the tube and it may still test as new.