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DEP215

 
See also:
Marconi DEP215 Advert, March 23, 1927 - The Truth About the Pentode - Osram DEP215 Box - Marconi 1928/9 Range
    
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The DEP215 is a four pin triode from Osram that has internal metalisation obscuring most of the internal construction. The advert linked above shows the horizontal box anode with two parallel filament threads within the grid.
The balloon envelope is 43 mm in diameter and, excluding the B4 base pins, is 83 mm tall.
References: Advert & 1043. Type DEP215 was first introduced in 1927. See also 1927 adverts.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
2.0
0.15
120
-
-
6,250
-
6.25
Updated October 05, 2018.
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