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TB402

 
    
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The TB402 is a class B battery audio output double triode.
The load required is given as 14,500 Ω and the power output is 1.5 Watts.
The filaments are single inverted V's with tension springs at the top.
Top view showing the tension springs and tight fitting top mica. The coated filament is clearly visible in the closer triode.
Another view showing the close-spaced control grid winding.
The classic envelope is 42 mm in diameter and, excluding the base pins, is 93 mm tall.
References: Data. Type TB402 was first introduced in 1934. See also 1934 adverts.

 

Pin Connections
B7
1
2
3
4
5
6
7
g1(2)
g1(1)
a(1)
f
f
nc
a(2)

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vs
Vg
ra
2.0
0.2
150
3.0
0
14,000
Updated August 30, 2024.
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