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VT61

Sensibly equivalent to:
4074A CV1061 DET19 RK34 VT-224
See also:
CV1061 short entry
    
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The VT61 transmitting double triode covers the VHF frequency range. The triode can be driven hard and this valve can accept a grid current of 15 mA. The number of equivalent types attests to its utility.
The VT indicates a pre CV Register valve Type specified by the RAF. The VT61 was employed as the modulator valve in the transmitter of the 'Spitfire' fighter plane of WWII.
The base cap is ceramic and impervious to moisture, a clear sign of a valve designed for aircraft use.
The classic envelope is 42 mm in diameter and, excluding the UX7 base pins, is 110 mm tall.
References: Datasheet. Type VT61 was first introduced in 1938.

 

Pin Connections
UX7
1
2
3
4
5
6
7
tc
tc
h
-
g1(1)
k
g1(2)
-
h
a(1)
a(2)

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
Pdriv
Pdiss
Pout
freq
f.max
6.3
0.8
300
-50
80
2W
5W
15.9W
50MHz
250MHz.
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated August 02, 2015.
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