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CV2299

Sensibly equivalent to:
DL73 VX8092
    
Extras ▼

 

The CV2299 specification was based on the VX8092 and the Mullard DL73 is the commercial version. It is a dry battery output pentode, but made as a beam tetrode. It is similar to the DL71 and DL72 hearing aid output valves but delivers a significantly greater output. The anode resistance of 16,000 Ohms is only 10% of the other similar valves but audio is not the main application unless as a modulator.
The CV2299 is specified for use as a VHF transmitter power amplifier. One Watt does not seem much but at 200 MHz would have a range of a few miles in an urban environment and in open country a few tens of miles with an efficient aerial. As a personal radio with a whip aerial the range would be much less but still useful.
The filament is a single strand of oxide coated wire, the tension spring can be seen on the left.
The anode consists of a grey plate formed into two active areas and two smaller straps. Within the straps can be seen a bright plate, this is the beam plate.
The thin glass tube envelope is 10 mm in diameter, and excluding the B8D base pins is 42 mm tall.
References: Datasheet & 1040.

 

Pin Connections
B8D & B8D/F
1
2
3
4
5
6
7
8
ic
g1
-
f-,g3
f+
-
a
g2

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
1.25
0.2
100
100
-9
15
3.8
16,000
2.5

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
Pdiss
Pout
freq
1.25
0.2
150
75
-2
18.6
5.6
2.0W
1.2W
200
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December19, 2016.
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