The 6C33C-B and the 6C33S-V is the exact same tube. Different translations of Russian. Check out this page and that page. The 6C18C is an older equivalent - not as good. Many factories made the 6C33C-B tube back in the day.
I’m pretty sure that I purchased the ones from the Ulyanovsk factory. Bought them from Russian and Ukraine sellers with 100% positive feedback. Never had a problem. Allow 6-8 weeks for standard economy delivery.
As with many Ebay sellers, different prices for the exact same item. I paid around $20/tube plus shipping. It appears that the prices have skyrocketed then.
Visit this site for more in-depth info. Interesting photos of the tube in the guidance system of a Russian cruise missile. Unfortunately, it was aimed at us.
I’m pretty sure that I purchased the ones from the Ulyanovsk factory. Bought them from Russian and Ukraine sellers with 100% positive feedback. Never had a problem. Allow 6-8 weeks for standard economy delivery.
As with many Ebay sellers, different prices for the exact same item. I paid around $20/tube plus shipping. It appears that the prices have skyrocketed then.
Visit this site for more in-depth info. Interesting photos of the tube in the guidance system of a Russian cruise missile. Unfortunately, it was aimed at us.