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6K7GT

Sensibly equivalent to:
CV1943 VT-86B
See also:
Metal Striptease - The 'Magic Three' Valves
    
Extras ▼

 

The 6K7GT pentode was designed in the mid to late 1930s for intermediate frequency amplifiers in 'modern' superhet type receivers. It is high impedance allowing for a high Q in the tuned anode circuit.
Watford Valves site has the following information on Fivre. Fivre was the largest all-Italian company, founded in 1932 in Pavia by Magneti Marelli to produce vacuum tubes under Radiotron (RCA) license.
See also the 6K7G full sized glass envelope version, and 6K7 original metal valve.
The perforated cylinder is the outer screen. The paper label contains the maker's logo but the black overprinting obscures the design.
The right side of the paper label.
The wide glass tube envelope is 28 mm in diameter and excluding the IO base pins the valve is 78 mm long.
References: Datasheet & 1040. Type 6K7GT was first introduced in 1938.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
a
g2
g3
nc
h
k

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
125
-3
10.5
2.6
0.6M
1.65
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 12, 2017.
shape:wide.glass.tube construction:pinch type:pentode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.g2 pin:5.g3 pin:6.nc pin:7.h pin:8.k
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