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KT61

Sensibly equivalent to:
6AG6 6P25 CV1438 CV2938 EL33 N147 OM9
See also:
Valves for Power Amplification Advert
    
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The KT61 audio output valve, part of a series of very successful valves from M-OV, features the standard 6.3 Volt heater that was introduced from America in the mid 1930's.
Characteristic plot taken with the μTracer.
The Marconi label. The other side has the M-OV etched lozenge with the KT61 in the centre.
The classic envelope is 42 mm in diameter and, excluding the IO base pins, is 102 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
8.5
10.5
4.3
8%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated September 30, 2014.
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