VT25_GPO (VT25_GPO)

The original version of the VT25 had an American made "Shaw" Navy metal shell UV base with the Shaw logo of an "S " inside a diamond stamped into the base within the pin area. These tubes were tipped. Later tipless versions, c. 1930, had a metal shell Shaw base which was polished nickel plated. The VT39 and VT40 tubes, similar to the later VT25 were also fitted with the polished Shaw base. 

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