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210DDT

Sensibly equivalent to:
CV1044 H20 HD24 HL21DD K23B TDD2A VR44
See also:
CV1044 short entry
    
Extras ▼

 

The 210DDT is a double diode triode designed for battery operated broadcast receivers. Normally such a valve would be placed at the end of the IF amplification in a superhet receiver. The triode would act as the audio voltage amplifier with the diodes acting as signal demodulator and AGC rectifier.
The reverse is plain zinc paint. The circle is the fixing for the wire connecting to the metalising.
The classic envelope is 44 mm in diameter, and excluding the B5 base pins is 106 mm tall.
Reference: 1043. Type 210DDT was first introduced in 1938.

 

Pin Connections
B5
1
2
3
4
5
tc
a
a(d1)
f(-)
f(+)
a(d2)
g1

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
2.0
0.1
85
-1.5
0.35
58,500
0.48
Updated April 03, 2015.
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