I don't think GEC ever made an 845. Agreed on the prices for NOS ones. I've looked long and hard and have been able to scratch up a few. Amperex also made 845s. Honestly the Chinese ones sound *quite* good, much better than any other chinese tubes I've heard. Save the $ and put it into the front end tubes, I'd say. That said, the NOS ones *are* better, but the price vs. value is something you have consider yourself. They occasionally come up on Ebay, I Think there are a couple there now. Prices there have averaged around $300-350 for the last half dozen that went through there. Www.tubeworld.com/tubes.html has some - but be prepared to bend over... and bring a big wallet. ;-)
-Ed
-Ed