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KTW61

Sensibly equivalent to:
KTW62 NR64 POVT193 W61
See also:
Osram KTW61 Advert
    
Extras ▼

 

The KTW61 is a variable μ RF amplifier beam tetrode, and was first introduced in 1939. The literature classifies these valves as pentodes but the images show the bright beam plates.
The up arrow for an RAF valve.
The top screen and electrode supports passing through the top mica support.
Thanks to Anurag aggarwal for sending the Osram data-sheet.
The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 105 mm tall.
References: Data-sheet, 1040 & 1043. Type KTW61 was first introduced in 1939. See also 1939 adverts.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
tc
m
h
a
g2
g3
nc
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 March 07, 2022.
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