▼ Menu

KTW61

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

 

The KTW61 is a variable μ RF amplifier pentode, and was first introduced in 1939. This tubular version is probably of post war manufacture.
The MWT paper logo.
Above the pinch is a lower screen that hides the grids.
The open helix of the suppressor grid with the close wound screen grid within. At full size the control grid is clearly seen.
The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 101 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 September 28, 2018.
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.- pin:7.h pin:8.k pin:tc.g1
Return to Main Index