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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. The KT61 forms part of a series of very successful valves from M-OV and in this exhibit it is badged as a consumer Marconiphone device. The electrodes are obscured by the coating on the glass.
The KT61 Type designation is etched into the envelope.
The classic envelope is 43 mm in diameter and, excluding the IO base pins, is 102 mm tall.
References: Data-sheet, 1043 & 1040. Type KT61 was first introduced in 1939. See also 1939 adverts.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
m
h
a
g2
g1
nc
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 07, 2022.
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