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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, like the Mullard EF86, 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 these valves 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.
The screening is extensive and just a glimpse of the wire grids is afforded by the notch in the screen. The anode is hidden behind the screen to the left and right.
The heater is wound as a double helix.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 47 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 January 20, 2017.
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