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NT58

Sensibly equivalent to:
4304CB 834 CV1062 CV1288 DET12 POVT121A TY1-50 VT62
    
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The NT58 (later renamed the CV1288) valve by GEC is a VHF transmitting triode with a commercial equivalent of the DET12. The datasheet is of the similar 834.
The thoriated tungsten filament is just visible at the bottom of the carbon anode cavity and is a spiral around the vertical rod that holds the wire and makes the return connection. The grid and anode are seen connecting to the top of the envelope by substantial supports. The anode dissipation was 50 Watts.
The balloon envelope is 60 mm in diameter and, excluding the B4 base pins, is 140 mm tall.
References: Datasheet, 1005 & 4001.

 

Pin Connections
B4
1
2
3
4
tc
tc
-
f
f
-
g1
a

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
Pdiss
Pdriv
Pout
freq
f.max
7.5
3.2
1000
-170
100
50w
6w
70W
100 MHz
300 MHz
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 02, 2015.
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