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CV2821

Sensibly equivalent to:
ECC33
    
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Mullard, in 1949, describe the CV2821 (ECC33) as a high slope, low impedance double triode with low heater consumption, primarily intended for use in flip-flop, scaling and computer circuits. The electrode assembly is considerably smaller than other double triodes of the period.
The twin triode sections. Inside the glass is a band of coating probably present to reduce any emissions from the glass due to prolonged electron bombardment.
The heater wires has been coiled and the the insulated hairpin of the heater can be seen entering the round cathode tube. The control grids are wound on copper supports.
The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 68 mm tall.
References: Data-sheet & 1040.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
g1(2)
a(2)
k(2)
g1(1)
a(1)
k(1)
h
h

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.4
250
-4
9
9,700
3.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 08, 2022.
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