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VT-198A

Sensibly equivalent to:
6G6G
    
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The VT-198A US Government procurement code and the commercial 6G6G both appear on this valve. It is an audio output pentode designed for radio receiver use where only a small output power is required. Thus the design emphasis was on minimising the overall power consumption both in HT and heater power.
The RCA logo.
The construction is as a pentode with three wire grids.
The classic envelope is 38 mm in diameter and, excluding the IO base pins the valve is 84 mm tall.
References: Data-sheet & 1040.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
a
g2
g1
-
h
k

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
D
6.3
0.15
180
180
-9
15
2.5
175k
1.1
10%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 26, 2018.
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