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CV5808

Sensibly equivalent to:
E55L
    
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The CV5808 is the E55L all glass pentode from Mullard and was designed as a high gain low impedance video/wide-band output valve.
The Mullard description of this valve is 'Special quality high slope output pentode intended for general industrial applications where stability of characteristics and long life are required.
The gm has a very high value, which both makes the wide-band capabilities possible and makes testing of used valves difficult.
The Mullard Type designation is side by side with the CV code.
Visual inspection shows that within the anode cavity are beam plates even though the device is quoted as a pentode. The screen grid is formed from a parallel series of very fine wires. The control grid is too close to the cathode to be seen. As is typical of special quality valves the base pins are gold plated to give low contact resistance and resist corrosion.
The wide glass tube envelope is 28 mm in diameter and, excluding the B9D base pins, is 58 mm tall.
Reference: Datasheet. Type CV5808 was first introduced in 1960.

 

Pin Connections
B9D
1
2
3
4
5
6
7
8
9
a
g3
g2
h
h
g3
k
g1
k

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.6
200
175
-55
50
5.5
20k
45

 

Absolute Maximum Operating Conditions
Pentode
Va
Vs
Vg
mAa
mAs
ra
gm
Pdiss
400
175
-55
70
5.5
20k
45
10W
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 16, 2013.
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