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We know that the Philips TC05/25 is a power triode and that this is an early version of the type.
See also The later version TC05/25-01 for details.
The balloon envelope is 62 mm in diameter and, excluding the B4 base pins, is 146 mm tall.
References: Data-sheet. Type TC05/25 was first introduced in 1953.


Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December03, 2012.
shape:balloon construction:pinch type:triode age:1930.1940 base:b4 heater:4.0v pins:4 pin:
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