This valve was donated to the museum with a heavy base that had been used to make a display of the device. It lacks any identification.Clearly this is a power triode with a graphite anode. It would have a high anode voltage as the insulators are ceramic and substantial.![](../pics/aaa1853a.jpg)
The eight pins emerging from the hard glass base. Only four have wires attached and it is probable that the original base was four pin only.![](../pics/aaa1853b.jpg)
The image shows the four filament supports and tension springs. The filament itself passes through the grid eight times and on test at 10 Volts takes around 5 Amps.The wide glass tube envelope is 82 mm in diameter and, excluding the 8 base pins, is 227 mm tall.Reference: Observation. |
Updated July 03, 2020.
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