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7C5

Sensibly equivalent to:
CV885 KT81 N148
See also:
American Loctal Valves
    
Extras ▼

 

The 7C5 is an audio output beam tetrode. The figures given are for single ended use with an anode load of 5,000 Ohms.
Brimar's data sheet gives the operating parameters as identical to the 6BW6. The latter is on a B9A base. The origin of the design is the RCA 6V6 originally on an IO base and introduced in the mid 1930s.
For push-pull use with anode voltages of 285 Volts and anode current of 35 mA the power out is 14 Watts in class AB1 with an anode to anode load of 8,000 Ohms.
The wide glass tube envelope is 28 mm in diameter and, excluding the B8B base pins, is 62 mm tall.
References: Datasheet & 1040. Type 7C5 was first introduced in 1939.

 

Pin Connections
B8B
1
2
3
4
5
6
7
8
h
a
g2
ic
ic
g1
k
h

 

Absolute Maximum Operating Conditions
Beam Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
D
6.3
0.45
250
250
-12.5
45.0
4.5
52,000
4.1
4.5
8%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated August 24, 2015.
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