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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 change to 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 a larger diameter bulb.
Thanks to Joe Gruber for sending the image.
The envelope is 32 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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