I'm not sure how the "new" 845 tubes compare to the Shuguangs, but thetubestore.com still has 845Bs if you decide to stick with those. They probably aren't as inexpensive as you found on ebay; however, as you metnion, they are getting tougher to find. I recently bought a spare pair of 845Cs because they are getting tough to find as well. Good luck!
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