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DDT215

 
    
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The DDT215 is a battery double diode triode for use in superhet receivers. The diodes form the detector and AGC rectifier and the triode would be used as the first audio voltage amplifier.
The envelope is covered with metalising paint and the connection to the coating can be seen by the base.
The classic envelope is 39 mm in diameter, and excluding the B5 base pins is 104 mm tall.
Reference: 1043. Type DDT215 was first introduced in 1937.

 

Pin Connections
B5
1
2
3
4
5
a
a(d1)
f(-)
f(+)
a(d2)

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
2.0
0.15
150
-
-
12.5
1.6
Updated December04, 2014.
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