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QQE04-20

Sensibly equivalent to:
832A
    
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The QQE04-20 is a dual transmitting beam tetrode. The design is of the American type with two separate valve electrode systems sealed into the single envelope. The oval cylinder anodes enclose the beam plates, grids and heater cathode assembly.
This type of construction usually required external capacitors to neutralise parasitic oscillations. These capacitors normally taking the form of vertical wires alongside the envelope.
This valve was obsolete by the start of the 1960s replaced by the QQV03-20 orQQV06-40A varieties.
The wide glass tube envelope is 50 mm in diameter and, excluding the B7A base pins, is 51 mm tall.
References: Datasheet. Type QQE04-20 was first introduced in 1957.

 

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
1.6
400
145
-45
170
17
4.5
0.23W
44
20W
125
200
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 26, 2013.
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