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Valves are Osram, 1 x KT33C, 1 x U31, 1 x KTZ63. There is a hole for another valve but it doesn't look as though it ever had a valve base in it, may be a standard chassis pressing which suited several models. There is a pencilled serial number, 101521 or more likely 10/521, which means it may be a TV10, although it does look more like the TV8. No date, unfortunately."