The 63SPT was A C Cossor's type designation number for the EF50s that it made and this example is a UK product and features black paint on the aluminium can.We also have a 63SPT made in the US for Cossor.The valve was so important during WWII that several manufacturers were involved although the design was a breakthrough for Philips in The Netherlands.
The plain aluminium screening can.The wide metal tube envelope is 34 mm in diameter and, excluding the B9A base pins, is 59 mm tall.References: Data-sheet & 1043. Type 63SPT was first introduced in 1938. See also 1938 adverts. |
