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6A8GT

Sensibly equivalent to:
CV580
    
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The 6A8GT is a triode heptode frequency changer. The oscillator is required to generate 20 Volts pk-pk.
Pinnacle were resellers of valves.
The other side carries the Type designation in an octagon logo - Made by RCA perhaps.
The IO base.
Thanks to Mark Mallison for sending the images.
The wide glass tube envelope is  mm in diameter and, excluding the IO base pins, is  mm tall.
Reference: Datasheet. Type 6A8GT was first introduced in 1937.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
h
a
g3,g5
g1
g2
h
k
g4

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
100
-3
3.5
2.7
0.36M
0.55

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
100
4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 13, 2019.
shape:wide.glass.tube type:triode.heptode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.g3.g5 pin:5.g1 pin:6.g2 pin:7.h pin:8.k pin:tc.g4
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