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VT-127A

Sensibly equivalent to:
100TS 3-100D2 Special
See also:
227A VT-127A 327A 327B 53A 527 15R & 15E Advert
    
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The VT-127A is a power triode of 100 Watt dissipation. The valve is directly heated with an oxide coated helical filament. The grid is a wire cage with a helical wire around it. The VHF construction has the Anode brought out to connections either side of the bulb. The grid is similarly brought out to a pair of connections. All connecting pins pass through Uranium glass seals.
The VT-127A was designed to operate as a ring oscillator at 205 MHz. The American SCR-268 radar, for the control of anti-aircraft guns, used 16 of this type of valve for the power oscillator. Operated in pulse mode the total power output was of the order of 60 kW.
See also 1628 for a similar construction.
The helical filament and cage grid.
The helical grid wire passing round the grid cage is clearly visible.
The uranium glass shows as green/yellow and will fluoresce in UV light.
The wide glass tube envelope is 74 mm in diameter, and excluding the base pins is 114 mm tall.
References: Internet.

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vg
mAa
5.0
10.4
3,000
-
210
Updated August 23, 2013.
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