[Amps] 4CX1600U - too good to be true?

[Bill, W6WRT]

Came across a 4CX1600U for sale on eBay, item number 260460157717 at a very low
price. Is this too good to be true? 

This tube is similar in ratings to the no-longer-available 4CX1600B. Has anyone
had any experience with it? With the price on eBay, this might well be the best
bang for the buck available on the Amateur market.

There is some question as to what socket will fit it.

Svetlana spec sheet at:  http://www.qsl.net/ik8rih/svetlana.pdf

73, Bill W6WRT