▼ Menu

VT61A

Sensibly equivalent to:
4074B CV1573 TV03-10
    
Extras ▼

 

The VT61A transmitting double triode was designed for use up to 150 MHz. It was made by Rogers of Canada and carries the Air Ministry markings. The VT prefix is an Air Force designation.
The operating parameters given are from the 4074A and this was a UX7 based valve as this is the closest match to the VT61 we could find. The 4074B is a B5 based valve of pinch construction in a classic glass envelope. The anodes are brought out to separate top caps.
Triodes were favoured for transmitter work over tetrodes because of lower capacitances and an ability to be driven harder. This valve was designed to pass a grid current of 17 mA.
The classic envelope is 46 mm in diameter and, excluding the B5 base pins, is 110 mm tall.
Reference: Datasheet.

 

Pin Connections
B5
1
2
3
4
5
tc
tc
g1(1)
g1(2)
h
h
k
a(1)
a(2)

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
Pdriv
Pout
6.3
0.8
300
-50
90
1W
15W
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 21, 2013.
Return to Main Index