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D-01A

Sensibly equivalent to:
D401A UX201A
See also:
DV and DL valves - Isolantite
    
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The D-01A was the first valve to be made by De Forest as an equivalent to another company's product. In this case the RCA UX201A.
The design use was as a detector - with a low anode voltage and a bias of -4.5 Volts - or as a voltage amplifier with a higher anode voltage and a grid bias of -9.0 Volts.
In 1928 this design was superseded by the D401A still with the UX4 base cap.
The original box for this early D-01A
Thanks to Joe Gruber for sending the images.
The balloon envelope is 45 mm in diameter and, including the UX4 base pins, is 112 mm tall.
Reference: Joe Gruber. Type D-01A was first introduced in 1927.

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
5.0
0.25
45-135
-4.5
Updated September 22, 2020.
shape:balloon construction:pinch type:triode age:1920.1930 base:ux4 heater:5.0v pins:4 pin:
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