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6BR7

Sensibly equivalent to:
6059 8D5 CV2135
See also:
Brimar 25P1 Amplifier - 10 Watt Ultra-Linear Amplifier - 11 Watt Ultra-Linear Amplifier
    
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Type 6BR7 was carefully designed for low internal noise and, especially, for low internal hum pick-up from the 6.3V AC heater, thus making it unnecessary to provide a DC source of heater current.
These features made it the standard 1960s choice for the input stage of sensitive hi-fi systems, displacing type EF37A which was the previous (British) favourite for this application. As such type 6BR7 remains in demand today for replacement purposes.
The direct equivalence of the CV2135 with the 6BR7 is demonstrated by the feint etched Brimar and 6BR7 on the glass and the white paint of the CV designation.
Extra mica sheets and significant internal screening are features of the design.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 48 mm tall.
References: 1040 & datasheet.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
-
g1
k
h
h
s
a
g2
g3

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.15
250
100
-3
2.1
0.6
2.3M
1.25
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 13, 2015.
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