[Amps] Close equivalents of the 4CX1500B

[Dr. David Kirkby]

I've seen a few tubes on eBay which the seller claims are the 4CX1500B.

This beaten up beast

http://www.ebay.co.uk/itm/290577205205

is a Y763, which is claimed to be a 4CX1500B.

This one is a YU-127

http://www.ebay.co.uk/itm/260795580006

which is again claimed to be a 4CX1500B.

Does anyone know the truth about these tubes? Are there any close equivalents to 
the 4CX1500B and if so, what are their part numbers?


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