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DL-7

 
See also:
DV and DL valves - Isolantite
    
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The De Forest DL series first appeared in 1926. The L references the adoption of the UX4 base.
The DL-7 was designed as an audio output valve. This Type was made with the standard tubular envelope and also with this larger diameter bulb.
Thanks to Joe Gruber for sending the image.
The envelope is  mm in diameter and, excluding the UX4 base pins, is  mm tall.
Reference: Bill Condon & Joe Gruber.

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
5.0
0.5
135
-9.0
6.0
6,500
1.1
7.0
Updated September 22, 2020.
shape:wide.glass.tube construction:pinch type:triode age:1920.1930 base:ux4 heater:5.0v pins:4 pin:
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