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N155

Sensibly equivalent to:
6BN5 EL85
    
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The N155 audio output valve from M-OV and the EL85 from Mullard are electrically identical to the B8A based EL42. When used for single ended audio applications a load resistance 9000 Ohms is specified.
The Mullard specification also gives RF operation to the low VHF as an application, say, in mobile transmitters.
The design is of a true pentode with three wire grids visible through the side holes in the anode.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 58 mm tall.
References: Datasheet & 1040. Type N155 was first introduced in 1957.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
D
6.3
0.2
225
225
-10.8
26
41
90k
3.2
2.8W
12%
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 29, 2016.
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