6C33C and 6C33C-B different?

Does anyone know what the differences are between 6C33C and 6C33C-B? I saw a Russian web site gstube.com have both listed for the same price and the pictures look the same too. Can I use one in place of the other?

sidssp03-31-2004 7:35pm

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raquel Details Discussions Posts This discussion Message User 841 posts 04-11-2004 at 01:56pm Copy Comment URL Report Comment Edit Delete Call Lamm or BAT, as they both use the former (and perhaps the latter).
gstubee9ef Details Discussions Posts This discussion Message User 1 posts 10-07-2004 at 05:31pm Copy Comment URL Report Comment Edit Delete I think no difference between 6C33C and 6C33C-B is for audio. Just first tube has some longer working perion (a little) but 6C33C are older usually. The second version is more widespread and more "young". Audio companies buy both tubes. Think the choice is matter of taste. Anton Zverev (www.gstube.com)
jedinite24 Details Discussions Posts This discussion Message User 1,503 posts 03-22-2013 at 02:11pm Copy Comment URL Report Comment Edit Delete I was researching 6C33C tubes and found this thread. Has anyone noticed a sonic difference or quality difference between 6C33C tubes from Novosibirsk or from Ulyanovsk? I often find listings for 6C33C tubes from these areas and don't know which one to get. I've been told the 6C33C-B were made for the military and the ones to get are from the Ulyanovsk. I don't want to try a set of tubes from each place because it gets very costly with shipping. Thanks

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