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832

Sensibly equivalent to:
CV634 CV1088 VT-118 VT88
See also:
CV1088 short entry
    
Extras ▼

 

The 832 is an American dual transmitting tetrode. We also have the later 832A in the museum.
The design the American type with two separate valves sealed into the single element, contrast this with QQE03-20 which is the classic European pattern. In use the American valves require external neutralisation capacitors whereas the European type has the capacitors built-in.
This valve was obsolete by the start of the 1960s replaced by the QQV03-20 or QQV06-40A varieties. It is typical of these RF power tetrodes that the base connections all match one another.
We cannot find accurate introduction date information but early to mid 1940's seems probable.
Made by National Union in USA.
The maker code on the left. One anode is seen face on and the wire grids can be seen at the base of the anode.
The twin independent sections are identical with curved anodes. As the pins are sited equi-spaced around the base, the locating pin has sleeve over it to increase the diameter.
The wide glass tube envelope reaches a maximum diameter of 50 mm, and excluding the B7A base pins, is 74 mm tall.
Reference: Datasheet.

 

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
500
200
-65
72
14
2.6
0.18W
26
15W
200
250
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 17, 2019.
shape:wide.glass.tube construction:all.glass type:double.beam.tetrode age:1940.1950 base:b7a heater:6.3v pins:7 pin:1.h pin:2.g1(2) pin:3.g2 pin:4.k.bp pin:5.hct pin:6.g1 pin:7.h pin:tc.a pin:tc.a(2)
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