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HD14

Sensibly equivalent to:
1H5GT CV1818 DAC32
    
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We can find no details for the HD4. The label is clear but possibly incorrect. The most probable identity is a B7 based version of the HD14 which has an IO base cap. This diode triode was produced by the M-OV company and the details given are for the HD14.
The classic envelope is 42 mm in diameter and, excluding the B7 base pins, is 105 mm tall.
References: 1040 & 1043. Type HD14 was first introduced in 1940.

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
1.4
0.05
90
0
0.14
0.24M
0.27
Updated January 27, 2013.
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