What are KT94 Vacuum Tubes?

I just bought an LA Audio 100R integrated amplifier. It uses four KT94 vacuum tubes. Upon searching the internet I found virtually nothing on KT94 tubes--just one Chinese website with no information. None of the major tube stores stock KT94s as far as I can tell. So...does anyone have any idea what these are? Where I can get some? Are there any compatiable tubes such as the KT88 etc.? Many thanks in advance for any help.