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6D6

Sensibly equivalent to:
58 C1408 CV1900 VT-69
    
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The 6D6 is a variable μ pentode for AGC controlled amplifiers at RF and IF in superhet radio receivers. Electrically the 6D6 (UX6 base) is identical to the Type 58 (UX6 base) and the 6U7G (IO base).
The Brimar identification is printed onto the Bakelite base cap.
The two part steel screen is held together with a spring clip. The words are Goat NY and Pat Pending. This was probably tin plated originally to give a shiny finish.
The classic envelope is 40 mm in diameter, and excluding the UX6 base pins is 107 mm tall.
References: Data-sheet, 1040 & 1043. Type 6D6 was first introduced in 1936.

 

Pin Connections
UX6
1
2
3
4
5
6
tc
h
a
g2
g3
k
h
g1

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
100
-3
8.2
2.0
0.8M
1.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated September 23, 2020.
shape:classic construction:pinch type:pentode age:1930.1940 base:ux6 heater:6.3v pins:6 pin:1.h pin:2.a pin:3.g2 pin:4.g3 pin:5.k pin:6.h pin:tc.g1
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