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KTW61

Sensibly equivalent to:
NR64 POVT193 W61
See also:
Osram KTW61 Advert
    
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This exhibit was marked on the envelope as a KTW62 as well as KTW61. The valve is a variable μ RF amplifier beam tetrode, and was first introduced in 1939. The literature classifies these valves as pentodes.
The classic envelope is 36 mm in diameter and, excluding the IO base pins, is 98 mm tall.
References: Datasheet, 1040 & 1043. Thanks to Anurag aggarwal for sending the Osram data-sheet. Type KTW61 was first introduced in 1939.

 

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

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
100
-3
8.0
2.7
0.46M
2.9
PDF scanned from an original document held by the museum
Updated October 22, 2016.
shape:classic construction:pinch type:beam.tetrode 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.- pin:7.h pin:8.k pin:tc.g1
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