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VT50

Sensibly equivalent to:
CV1050 HL2K
    
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The VT50 is a service designation for the HL2K, designed as a detector or audio voltage amplifier triode in battery receivers.
The bright anode with ribs for rigidity.
The top mica and filament tension springs.
The twin filaments strands can be seen hanging from the tension springs. The HL2 had a longer anode and a single inverted V filament.
The tension springs close-up.
The wide glass tube envelope is 29 mm in diameter and, excluding the B4 base pins, is 73 mm tall.
References: Datasheet, private communication, 1040, 1043, 3002 & 4001. Type VT50 was first introduced in 1934.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
2.0
0.1
150
-3
1.75
18k
1.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 11, 2013.
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