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QQV06-40A

Sensibly equivalent to:
55B/400A 5894/C178A 5894A 5894 CV2797 TT25
See also:
Mullard TX Valves Advert - Mullard QQV02-6 Advert - VHF Valve Anode Connector
    
Extras ▼

 

The QQV06-40A is a 1950s European pattern double beam tetrode VHF transmitting valve. The European pattern had internal neutralising unlike the American pattern valves such as the 829B that required external neutralising capacitors to prevent oscillations.
This exhibit has the later logo and QQV-06-40A has the older one. More details can be found under the other exhibit.
The glass envelope is 74 mm tall. The pins and top anodes are not gold plated and have started to corrode. The small wires at the top form the neutralising capacitors. The notch in the beam plates allows the screen grid to be glimpsed.
The anodes are grey and the beam plates are bright. In the centre the grid wires can be seen with the white coating on the cathode behind. The neutralising capacitor wires are on the extreme right.
A diagram showing the formation of the neutralising capacitors.
A close-up view of the aligned grids. The screen grid is easily seen and slopes slightly to the left. The fine control grid wires are vertical.
The wide glass tube envelope is 44 mm in diameter and, excluding the B7A base pins, is 91 mm tall.
References: Datasheet & 1040.

 

Pin Connections
B7A
1
2
3
4
5
6
7
tc
tc
h
g1(2)
g2
k,bp
hct
g1
h
a
a(2)

 

Absolute Maximum Operating Conditions
Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
mAg
Pdriv
Pout
Pdiss
freq
f.max
6.3
1.8
600
250
-80
200
18
7
3W
90
40W
275
486
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December11, 2015.
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