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KT61

Sensibly equivalent to:
6AG6 6P25 CV1438 CV2938 EL33 N147 OM9
    
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The KT61 is an audio output valve and features the standard 6.3 Volt heater that was introduced from America in the mid 1930s. The KT61 forms part of a series of very successful valves from M-OV.
The KT61 is a high gain valve designed to be used with little amplification before the output device.
The Osram brand label.
The classic envelope is 45 mm in diameter and, excluding the IO base pins, is 100 mm tall.
References: Datasheet, 1043 & 1040. Type KT61 was first introduced in 1939.

 

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

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
gm
Pout
D
6.3
0.95
250
250
-4.4
40.0
7.5
10.5
4.3
8%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 26, 2017.
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